Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate And Accumulated Depreciation (Real Estate And Accumulated Depreciation) (Details)

v3.20.4
Schedule III - Real Estate And Accumulated Depreciation (Real Estate And Accumulated Depreciation) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
ft²
property
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 27,728
Initial Cost to Company, Land $ 874,680
Initial Cost to Company, Buildings and Improvements 1,739,160
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 508,229
Gross Carrying Amount at December 31, 2020, Land 874,680
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,247,389
Gross Carrying Amount at December 31, 2020, Total 3,122,069
Accumulated Depreciation $ 1,229,102
Commercial Real Estate [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 27,728
Initial Cost to Company, Land $ 852,866
Initial Cost to Company, Buildings and Improvements 1,654,237
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 508,192
Gross Carrying Amount at December 31, 2020, Land 852,866
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,162,429
Gross Carrying Amount at December 31, 2020, Total 3,015,295
Accumulated Depreciation 1,221,175
Multifamily [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Initial Cost to Company, Land 21,814
Initial Cost to Company, Buildings and Improvements 84,923
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 37
Gross Carrying Amount at December 31, 2020, Land 21,814
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 84,960
Gross Carrying Amount at December 31, 2020, Total 106,774
Accumulated Depreciation $ 7,927
Buena Park Industrial Center [Member] | Commercial Real Estate [Member] | Buena Park, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 317
Initial Cost to Company, Land $ 3,245
Initial Cost to Company, Buildings and Improvements 7,703
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,640
Gross Carrying Amount at December 31, 2020, Land 3,245
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 11,343
Gross Carrying Amount at December 31, 2020, Total 14,588
Accumulated Depreciation $ 8,505
Year(s) Acquired 1997
Carson [Member] | Commercial Real Estate [Member] | Carson, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 77
Initial Cost to Company, Land $ 990
Initial Cost to Company, Buildings and Improvements 2,496
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,704
Gross Carrying Amount at December 31, 2020, Land 990
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 4,200
Gross Carrying Amount at December 31, 2020, Total 5,190
Accumulated Depreciation $ 3,397
Year(s) Acquired 1997
Cerritos Business Center [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 395
Initial Cost to Company, Land $ 4,218
Initial Cost to Company, Buildings and Improvements 10,273
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,765
Gross Carrying Amount at December 31, 2020, Land 4,218
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 15,038
Gross Carrying Amount at December 31, 2020, Total 19,256
Accumulated Depreciation $ 11,880
Year(s) Acquired 1997
Cerritos/Edwards [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 31
Initial Cost to Company, Land $ 450
Initial Cost to Company, Buildings and Improvements 1,217
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,661
Gross Carrying Amount at December 31, 2020, Land 450
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,878
Gross Carrying Amount at December 31, 2020, Total 3,328
Accumulated Depreciation $ 2,300
Year(s) Acquired 1997
Concord Business Park [Member] | Commercial Real Estate [Member] | Concord, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 246
Initial Cost to Company, Land $ 12,454
Initial Cost to Company, Buildings and Improvements 20,491
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,152
Gross Carrying Amount at December 31, 2020, Land 12,454
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 21,643
Gross Carrying Amount at December 31, 2020, Total 34,097
Accumulated Depreciation $ 8,093
Year(s) Acquired 2011
Culver City [Member] | Commercial Real Estate [Member] | Culver City, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 147
Initial Cost to Company, Land $ 3,252
Initial Cost to Company, Buildings and Improvements 8,157
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,375
Gross Carrying Amount at December 31, 2020, Land 3,252
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 14,532
Gross Carrying Amount at December 31, 2020, Total 17,784
Accumulated Depreciation $ 12,000
Year(s) Acquired 1997
Bayview Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 104
Initial Cost to Company, Land $ 4,990
Initial Cost to Company, Buildings and Improvements 4,831
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 387
Gross Carrying Amount at December 31, 2020, Land 4,990
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 5,218
Gross Carrying Amount at December 31, 2020, Total 10,208
Accumulated Depreciation $ 2,203
Year(s) Acquired 2011
Christy Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 334
Initial Cost to Company, Land $ 11,451
Initial Cost to Company, Buildings and Improvements 16,254
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,640
Gross Carrying Amount at December 31, 2020, Land 11,451
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 17,894
Gross Carrying Amount at December 31, 2020, Total 29,345
Accumulated Depreciation $ 7,415
Year(s) Acquired 2011
Industrial Drive Distribution Center [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 199
Initial Cost to Company, Land $ 7,482
Initial Cost to Company, Buildings and Improvements 6,812
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,243
Gross Carrying Amount at December 31, 2020, Land 7,482
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 8,055
Gross Carrying Amount at December 31, 2020, Total 15,537
Accumulated Depreciation $ 3,185
Year(s) Acquired 2011
Bay Center Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 463
Initial Cost to Company, Land $ 19,052
Initial Cost to Company, Buildings and Improvements 50,501
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,291
Gross Carrying Amount at December 31, 2020, Land 19,052
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 53,792
Gross Carrying Amount at December 31, 2020, Total 72,844
Accumulated Depreciation $ 19,804
Year(s) Acquired 2011
Cabot Distribution Center [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 249
Initial Cost to Company, Land $ 5,859
Initial Cost to Company, Buildings and Improvements 10,811
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 532
Gross Carrying Amount at December 31, 2020, Land 5,859
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 11,343
Gross Carrying Amount at December 31, 2020, Total 17,202
Accumulated Depreciation $ 3,725
Year(s) Acquired 2011
Diablo Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 271
Initial Cost to Company, Land $ 9,102
Initial Cost to Company, Buildings and Improvements 15,721
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,079
Gross Carrying Amount at December 31, 2020, Land 9,102
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 16,800
Gross Carrying Amount at December 31, 2020, Total 25,902
Accumulated Depreciation $ 6,263
Year(s) Acquired 2011
Eden Landing [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 83
Initial Cost to Company, Land $ 3,275
Initial Cost to Company, Buildings and Improvements 6,174
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 142
Gross Carrying Amount at December 31, 2020, Land 3,275
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 6,316
Gross Carrying Amount at December 31, 2020, Total 9,591
Accumulated Depreciation $ 2,348
Year(s) Acquired 2011
Hayward Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 1,091
Initial Cost to Company, Land $ 28,256
Initial Cost to Company, Buildings and Improvements 54,418
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,849
Gross Carrying Amount at December 31, 2020, Land 28,256
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 59,267
Gross Carrying Amount at December 31, 2020, Total 87,523
Accumulated Depreciation $ 20,384
Year(s) Acquired 2011
Huntwood Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 176
Initial Cost to Company, Land $ 7,391
Initial Cost to Company, Buildings and Improvements 11,819
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 964
Gross Carrying Amount at December 31, 2020, Land 7,391
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 12,783
Gross Carrying Amount at December 31, 2020, Total 20,174
Accumulated Depreciation $ 4,752
Year(s) Acquired 2011
Parkway Commerce [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 407
Initial Cost to Company, Land $ 4,398
Initial Cost to Company, Buildings and Improvements 10,433
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,711
Gross Carrying Amount at December 31, 2020, Land 4,398
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 15,144
Gross Carrying Amount at December 31, 2020, Total 19,542
Accumulated Depreciation $ 12,021
Year(s) Acquired 1997
La Mirada Commerce Center [Member] | Commercial Real Estate [Member] | La Mirada, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 73
Initial Cost to Company, Land $ 11,122
Initial Cost to Company, Buildings and Improvements 2,153
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 180
Gross Carrying Amount at December 31, 2020, Land 11,122
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,333
Gross Carrying Amount at December 31, 2020, Total 13,455
Accumulated Depreciation $ 211
Year(s) Acquired 2020
Laguna Hills Commerce Center [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 513
Initial Cost to Company, Land $ 16,262
Initial Cost to Company, Buildings and Improvements 39,559
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 8,621
Gross Carrying Amount at December 31, 2020, Land 16,262
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 48,180
Gross Carrying Amount at December 31, 2020, Total 64,442
Accumulated Depreciation $ 37,460
Year(s) Acquired 1997
Plaza Del Lago [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 101
Initial Cost to Company, Land $ 2,037
Initial Cost to Company, Buildings and Improvements 5,051
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,259
Gross Carrying Amount at December 31, 2020, Land 2,037
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,310
Gross Carrying Amount at December 31, 2020, Total 11,347
Accumulated Depreciation $ 7,502
Year(s) Acquired 1997
Canada Business Center [Member] | Commercial Real Estate [Member] | Lake Forest, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 297
Initial Cost to Company, Land $ 5,508
Initial Cost to Company, Buildings and Improvements 13,785
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,753
Gross Carrying Amount at December 31, 2020, Land 5,508
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 20,538
Gross Carrying Amount at December 31, 2020, Total 26,046
Accumulated Depreciation $ 16,269
Year(s) Acquired 1997
Dixon Landing Business Park [Member] | Commercial Real Estate [Member] | Milpitas, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 505
Initial Cost to Company, Land $ 26,301
Initial Cost to Company, Buildings and Improvements 21,121
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,148
Gross Carrying Amount at December 31, 2020, Land 26,301
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 25,269
Gross Carrying Amount at December 31, 2020, Total 51,570
Accumulated Depreciation $ 10,651
Year(s) Acquired 2011
Monterey/Calle [Member] | Commercial Real Estate [Member] | Monterey, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 12
Initial Cost to Company, Land $ 288
Initial Cost to Company, Buildings and Improvements 706
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 384
Gross Carrying Amount at December 31, 2020, Land 288
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 1,090
Gross Carrying Amount at December 31, 2020, Total 1,378
Accumulated Depreciation $ 882
Year(s) Acquired 1997
Monterey Park [Member] | Commercial Real Estate [Member] | Monterey Park, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 199
Initial Cost to Company, Land $ 3,078
Initial Cost to Company, Buildings and Improvements 7,862
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,836
Gross Carrying Amount at December 31, 2020, Land 3,078
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,698
Gross Carrying Amount at December 31, 2020, Total 12,776
Accumulated Depreciation $ 7,809
Year(s) Acquired 1997
Port Of Oakland [Member] | Commercial Real Estate [Member] | Oakland, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 200
Initial Cost to Company, Land $ 5,638
Initial Cost to Company, Buildings and Improvements 11,066
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 843
Gross Carrying Amount at December 31, 2020, Land 5,638
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 11,909
Gross Carrying Amount at December 31, 2020, Total 17,547
Accumulated Depreciation $ 4,502
Year(s) Acquired 2011
Kearney Mesa [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 164
Initial Cost to Company, Land $ 2,894
Initial Cost to Company, Buildings and Improvements 7,089
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,800
Gross Carrying Amount at December 31, 2020, Land 2,894
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 10,889
Gross Carrying Amount at December 31, 2020, Total 13,783
Accumulated Depreciation $ 8,230
Year(s) Acquired 1997
Lusk [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 371
Initial Cost to Company, Land $ 5,711
Initial Cost to Company, Buildings and Improvements 14,049
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,612
Gross Carrying Amount at December 31, 2020, Land 5,711
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 20,661
Gross Carrying Amount at December 31, 2020, Total 26,372
Accumulated Depreciation $ 16,463
Year(s) Acquired 1997
Rose Canyon Business Park [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 233
Initial Cost to Company, Land $ 15,129
Initial Cost to Company, Buildings and Improvements 20,054
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,792
Gross Carrying Amount at December 31, 2020, Land 15,129
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 22,846
Gross Carrying Amount at December 31, 2020, Total 37,975
Accumulated Depreciation $ 14,769
Year(s) Acquired 2005
Charcot Business Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 283
Initial Cost to Company, Land $ 18,654
Initial Cost to Company, Buildings and Improvements 17,580
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,939
Gross Carrying Amount at December 31, 2020, Land 18,654
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 19,519
Gross Carrying Amount at December 31, 2020, Total 38,173
Accumulated Depreciation $ 8,087
Year(s) Acquired 2011/2014
Las Plumas [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 214
Initial Cost to Company, Land $ 4,379
Initial Cost to Company, Buildings and Improvements 12,889
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,898
Gross Carrying Amount at December 31, 2020, Land 4,379
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 19,787
Gross Carrying Amount at December 31, 2020, Total 24,166
Accumulated Depreciation $ 16,750
Year(s) Acquired 1998
Little Orchard Distribution Center [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 213
Initial Cost to Company, Land $ 7,725
Initial Cost to Company, Buildings and Improvements 3,846
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,210
Gross Carrying Amount at December 31, 2020, Land 7,725
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 5,056
Gross Carrying Amount at December 31, 2020, Total 12,781
Accumulated Depreciation $ 1,822
Year(s) Acquired 2011
Montague Industrial Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 316
Initial Cost to Company, Land $ 14,476
Initial Cost to Company, Buildings and Improvements 12,807
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 718
Gross Carrying Amount at December 31, 2020, Land 14,476
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 13,525
Gross Carrying Amount at December 31, 2020, Total 28,001
Accumulated Depreciation $ 5,977
Year(s) Acquired 2011
Oakland Road [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 177
Initial Cost to Company, Land $ 3,458
Initial Cost to Company, Buildings and Improvements 8,765
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,330
Gross Carrying Amount at December 31, 2020, Land 3,458
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 12,095
Gross Carrying Amount at December 31, 2020, Total 15,553
Accumulated Depreciation $ 9,794
Year(s) Acquired 1997
Rogers Ave [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 67
Initial Cost to Company, Land $ 3,540
Initial Cost to Company, Buildings and Improvements 4,896
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 553
Gross Carrying Amount at December 31, 2020, Land 3,540
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 5,449
Gross Carrying Amount at December 31, 2020, Total 8,989
Accumulated Depreciation $ 3,229
Year(s) Acquired 2006
Doolittle Business Park [Member] | Commercial Real Estate [Member] | San Leandro, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 113
Initial Cost to Company, Land $ 3,929
Initial Cost to Company, Buildings and Improvements 6,231
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 378
Gross Carrying Amount at December 31, 2020, Land 3,929
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 6,609
Gross Carrying Amount at December 31, 2020, Total 10,538
Accumulated Depreciation $ 2,488
Year(s) Acquired 2011
Bayshore Corporate Center [Member] | Commercial Real Estate [Member] | San Mateo, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 340
Initial Cost to Company, Land $ 25,109
Initial Cost to Company, Buildings and Improvements 36,891
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 7,453
Gross Carrying Amount at December 31, 2020, Land 25,109
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 44,344
Gross Carrying Amount at December 31, 2020, Total 69,453
Accumulated Depreciation $ 17,316
Year(s) Acquired 2013
San Ramon/Norris Canyon [Member] | Commercial Real Estate [Member] | San Ramon, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 52
Initial Cost to Company, Land $ 1,486
Initial Cost to Company, Buildings and Improvements 3,642
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,348
Gross Carrying Amount at December 31, 2020, Land 1,486
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 4,990
Gross Carrying Amount at December 31, 2020, Total 6,476
Accumulated Depreciation $ 3,995
Year(s) Acquired 1997
Commerce Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 251
Initial Cost to Company, Land $ 17,218
Initial Cost to Company, Buildings and Improvements 21,914
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,681
Gross Carrying Amount at December 31, 2020, Land 17,218
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 25,595
Gross Carrying Amount at December 31, 2020, Total 42,813
Accumulated Depreciation $ 17,706
Year(s) Acquired 2007
Santa Clara Tech Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 178
Initial Cost to Company, Land $ 7,673
Initial Cost to Company, Buildings and Improvements 15,645
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,661
Gross Carrying Amount at December 31, 2020, Land 7,673
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 19,306
Gross Carrying Amount at December 31, 2020, Total 26,979
Accumulated Depreciation $ 14,791
Year(s) Acquired 2000
San Tomas Business Center [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 79
Initial Cost to Company, Land $ 12,932
Initial Cost to Company, Buildings and Improvements 3,549
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 423
Gross Carrying Amount at December 31, 2020, Land 12,932
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 3,972
Gross Carrying Amount at December 31, 2020, Total 16,904
Accumulated Depreciation $ 454
Year(s) Acquired 2019
Walsh At Lafayette [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 321
Initial Cost to Company, Land $ 13,439
Initial Cost to Company, Buildings and Improvements 17,890
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,035
Gross Carrying Amount at December 31, 2020, Land 13,439
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 18,925
Gross Carrying Amount at December 31, 2020, Total 32,364
Accumulated Depreciation $ 7,932
Year(s) Acquired 2011
Hathaway Industrial Park [Member] | Commercial Real Estate [Member] | Santa Fe Springs, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 543
Initial Cost to Company, Land $ 65,494
Initial Cost to Company, Buildings and Improvements 36,786
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,052
Gross Carrying Amount at December 31, 2020, Land 65,494
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 38,838
Gross Carrying Amount at December 31, 2020, Total 104,332
Accumulated Depreciation $ 1,975
Year(s) Acquired 2019
Signal Hill [Member] | Commercial Real Estate [Member] | Signal Hill, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 343
Initial Cost to Company, Land $ 16,360
Initial Cost to Company, Buildings and Improvements 16,678
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,709
Gross Carrying Amount at December 31, 2020, Land 16,360
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 20,387
Gross Carrying Amount at December 31, 2020, Total 36,747
Accumulated Depreciation $ 11,819
Year(s) Acquired 1997/2006/2019
Airport Boulevard [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 52
Initial Cost to Company, Land $ 899
Initial Cost to Company, Buildings and Improvements 2,387
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 813
Gross Carrying Amount at December 31, 2020, Land 899
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 3,200
Gross Carrying Amount at December 31, 2020, Total 4,099
Accumulated Depreciation $ 2,600
Year(s) Acquired 1997
South San Francisco/Produce [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 41
Initial Cost to Company, Land $ 776
Initial Cost to Company, Buildings and Improvements 1,886
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 528
Gross Carrying Amount at December 31, 2020, Land 776
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,414
Gross Carrying Amount at December 31, 2020, Total 3,190
Accumulated Depreciation $ 1,942
Year(s) Acquired 1997
Studio City/Ventura [Member] | Commercial Real Estate [Member] | Studio City, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 22
Initial Cost to Company, Land $ 621
Initial Cost to Company, Buildings and Improvements 1,530
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 552
Gross Carrying Amount at December 31, 2020, Land 621
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,082
Gross Carrying Amount at December 31, 2020, Total 2,703
Accumulated Depreciation $ 1,713
Year(s) Acquired 1997
Kifer Industrial Park [Member] | Commercial Real Estate [Member] | Sunnyvale, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 287
Initial Cost to Company, Land $ 13,227
Initial Cost to Company, Buildings and Improvements 37,874
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,698
Gross Carrying Amount at December 31, 2020, Land 13,227
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 39,572
Gross Carrying Amount at December 31, 2020, Total 52,799
Accumulated Depreciation $ 14,379
Year(s) Acquired 2011
Torrance [Member] | Commercial Real Estate [Member] | Torrance, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 147
Initial Cost to Company, Land $ 2,318
Initial Cost to Company, Buildings and Improvements 6,069
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,703
Gross Carrying Amount at December 31, 2020, Land 2,318
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,772
Gross Carrying Amount at December 31, 2020, Total 12,090
Accumulated Depreciation $ 7,871
Year(s) Acquired 1997
Boca Commerce [Member] | Commercial Real Estate [Member] | Boca Raton, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 135
Initial Cost to Company, Land $ 7,795
Initial Cost to Company, Buildings and Improvements 9,258
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,220
Gross Carrying Amount at December 31, 2020, Land 7,795
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 12,478
Gross Carrying Amount at December 31, 2020, Total 20,273
Accumulated Depreciation $ 7,474
Year(s) Acquired 2006
MICC [Member] | Commercial Real Estate [Member] | Miami, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 3,468
Initial Cost to Company, Land $ 95,115
Initial Cost to Company, Buildings and Improvements 112,583
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 43,176
Gross Carrying Amount at December 31, 2020, Land 95,115
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 155,759
Gross Carrying Amount at December 31, 2020, Total 250,874
Accumulated Depreciation $ 104,953
Year(s) Acquired 2003/2011/2014
Wellington [Member] | Commercial Real Estate [Member] | Wellington, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 263
Initial Cost to Company, Land $ 10,845
Initial Cost to Company, Buildings and Improvements 18,560
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,645
Gross Carrying Amount at December 31, 2020, Land 10,845
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 21,205
Gross Carrying Amount at December 31, 2020, Total 32,050
Accumulated Depreciation $ 11,404
Year(s) Acquired 2006
Ammendale [Member] | Commercial Real Estate [Member] | Beltsville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 308
Initial Cost to Company, Land $ 4,278
Initial Cost to Company, Buildings and Improvements 18,380
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 11,125
Gross Carrying Amount at December 31, 2020, Land 4,278
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 29,505
Gross Carrying Amount at December 31, 2020, Total 33,783
Accumulated Depreciation $ 24,931
Year(s) Acquired 1998
Gaithersburgh/Christopher [Member] | Commercial Real Estate [Member] | Gaithersburg, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 29
Initial Cost to Company, Land $ 475
Initial Cost to Company, Buildings and Improvements 1,203
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 905
Gross Carrying Amount at December 31, 2020, Land 475
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,108
Gross Carrying Amount at December 31, 2020, Total 2,583
Accumulated Depreciation $ 1,648
Year(s) Acquired 1997
Gude Drive (Land) [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Initial Cost to Company, Land $ 1,142
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 328
Gross Carrying Amount at December 31, 2020, Land 1,142
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 328
Gross Carrying Amount at December 31, 2020, Total 1,470
Accumulated Depreciation $ 227
Year(s) Acquired 2001
Parklawn Business Park [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 231
Initial Cost to Company, Land $ 3,387
Initial Cost to Company, Buildings and Improvements 19,628
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,100
Gross Carrying Amount at December 31, 2020, Land 3,387
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 25,728
Gross Carrying Amount at December 31, 2020, Total 29,115
Accumulated Depreciation $ 12,798
Year(s) Acquired 2010
The Grove 270 [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 577
Initial Cost to Company, Land $ 11,009
Initial Cost to Company, Buildings and Improvements 58,364
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 22,367
Gross Carrying Amount at December 31, 2020, Land 11,009
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 80,731
Gross Carrying Amount at December 31, 2020, Total 91,740
Accumulated Depreciation $ 36,534
Year(s) Acquired 2010/2016
Ben White [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 108
Initial Cost to Company, Land $ 1,550
Initial Cost to Company, Buildings and Improvements 7,015
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,407
Gross Carrying Amount at December 31, 2020, Land 1,550
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 10,422
Gross Carrying Amount at December 31, 2020, Total 11,972
Accumulated Depreciation $ 6,909
Year(s) Acquired 1998
Lamar Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 198
Initial Cost to Company, Land $ 2,528
Initial Cost to Company, Buildings and Improvements 6,596
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 8,268
Gross Carrying Amount at December 31, 2020, Land 2,528
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 14,864
Gross Carrying Amount at December 31, 2020, Total 17,392
Accumulated Depreciation $ 11,480
Year(s) Acquired 1997
McKalla [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 236
Initial Cost to Company, Land $ 1,945
Initial Cost to Company, Buildings and Improvements 13,212
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,554
Gross Carrying Amount at December 31, 2020, Land 1,945
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 15,766
Gross Carrying Amount at December 31, 2020, Total 17,711
Accumulated Depreciation $ 9,598
Year(s) Acquired 1998/2012
McNeil [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 525
Initial Cost to Company, Land $ 5,477
Initial Cost to Company, Buildings and Improvements 24,495
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 5,982
Gross Carrying Amount at December 31, 2020, Land 5,477
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 30,477
Gross Carrying Amount at December 31, 2020, Total 35,954
Accumulated Depreciation $ 15,196
Year(s) Acquired 1999/2010/2012/2014
Rutland [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 235
Initial Cost to Company, Land $ 2,022
Initial Cost to Company, Buildings and Improvements 9,397
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,304
Gross Carrying Amount at December 31, 2020, Land 2,022
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 11,701
Gross Carrying Amount at December 31, 2020, Total 13,723
Accumulated Depreciation $ 9,174
Year(s) Acquired 1998/1999
Waterford [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 106
Initial Cost to Company, Land $ 2,108
Initial Cost to Company, Buildings and Improvements 9,649
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,043
Gross Carrying Amount at December 31, 2020, Land 2,108
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 13,692
Gross Carrying Amount at December 31, 2020, Total 15,800
Accumulated Depreciation $ 11,037
Year(s) Acquired 1999
Braker Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 257
Initial Cost to Company, Land $ 1,874
Initial Cost to Company, Buildings and Improvements 13,990
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,094
Gross Carrying Amount at December 31, 2020, Land 1,874
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 17,084
Gross Carrying Amount at December 31, 2020, Total 18,958
Accumulated Depreciation $ 8,829
Year(s) Acquired 2010
Mopac Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 117
Initial Cost to Company, Land $ 719
Initial Cost to Company, Buildings and Improvements 3,579
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 697
Gross Carrying Amount at December 31, 2020, Land 719
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 4,276
Gross Carrying Amount at December 31, 2020, Total 4,995
Accumulated Depreciation $ 2,177
Year(s) Acquired 2010
Southpark Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 181
Initial Cost to Company, Land $ 1,266
Initial Cost to Company, Buildings and Improvements 9,882
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,629
Gross Carrying Amount at December 31, 2020, Land 1,266
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 12,511
Gross Carrying Amount at December 31, 2020, Total 13,777
Accumulated Depreciation $ 6,526
Year(s) Acquired 2010
Valwood Business Center [Member] | Commercial Real Estate [Member] | Carrolton, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 356
Initial Cost to Company, Land $ 2,510
Initial Cost to Company, Buildings and Improvements 13,859
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,135
Gross Carrying Amount at December 31, 2020, Land 2,510
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 16,994
Gross Carrying Amount at December 31, 2020, Total 19,504
Accumulated Depreciation $ 6,752
Year(s) Acquired 2013
Northway Plaza [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 131
Initial Cost to Company, Land $ 1,742
Initial Cost to Company, Buildings and Improvements 4,503
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,751
Gross Carrying Amount at December 31, 2020, Land 1,742
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 6,254
Gross Carrying Amount at December 31, 2020, Total 7,996
Accumulated Depreciation $ 2,342
Year(s) Acquired 2013
Springlake Business Center [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 206
Initial Cost to Company, Land $ 2,607
Initial Cost to Company, Buildings and Improvements 5,715
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,701
Gross Carrying Amount at December 31, 2020, Land 2,607
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 7,416
Gross Carrying Amount at December 31, 2020, Total 10,023
Accumulated Depreciation $ 3,381
Year(s) Acquired 2013/2014
Westwood Business Park [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 112
Initial Cost to Company, Land $ 941
Initial Cost to Company, Buildings and Improvements 6,884
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,401
Gross Carrying Amount at December 31, 2020, Land 941
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,285
Gross Carrying Amount at December 31, 2020, Total 10,226
Accumulated Depreciation $ 6,476
Year(s) Acquired 2003
Eastgate [Member] | Commercial Real Estate [Member] | Garland, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 36
Initial Cost to Company, Land $ 480
Initial Cost to Company, Buildings and Improvements 1,203
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 474
Gross Carrying Amount at December 31, 2020, Land 480
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 1,677
Gross Carrying Amount at December 31, 2020, Total 2,157
Accumulated Depreciation $ 1,377
Year(s) Acquired 1997
Freeport Business Park [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 256
Initial Cost to Company, Land $ 4,564
Initial Cost to Company, Buildings and Improvements 9,506
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,974
Gross Carrying Amount at December 31, 2020, Land 4,564
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 12,480
Gross Carrying Amount at December 31, 2020, Total 17,044
Accumulated Depreciation $ 5,723
Year(s) Acquired 2013
NFTZ [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 231
Initial Cost to Company, Land $ 1,517
Initial Cost to Company, Buildings and Improvements 6,499
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,019
Gross Carrying Amount at December 31, 2020, Land 1,517
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 10,518
Gross Carrying Amount at December 31, 2020, Total 12,035
Accumulated Depreciation $ 8,621
Year(s) Acquired 1998
Number of properties subject to ground leases | property 2
Royal Tech [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 794
Initial Cost to Company, Land $ 13,989
Initial Cost to Company, Buildings and Improvements 54,113
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 27,594
Gross Carrying Amount at December 31, 2020, Land 13,989
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 81,707
Gross Carrying Amount at December 31, 2020, Total 95,696
Accumulated Depreciation $ 60,493
Year(s) Acquired 1998-2000/2011
La Prada [Member] | Commercial Real Estate [Member] | Mesquite, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 56
Initial Cost to Company, Land $ 495
Initial Cost to Company, Buildings and Improvements 1,235
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 823
Gross Carrying Amount at December 31, 2020, Land 495
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 2,058
Gross Carrying Amount at December 31, 2020, Total 2,553
Accumulated Depreciation $ 1,641
Year(s) Acquired 1997
The Summit [Member] | Commercial Real Estate [Member] | Plano, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 184
Initial Cost to Company, Land $ 1,536
Initial Cost to Company, Buildings and Improvements 6,654
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,212
Gross Carrying Amount at December 31, 2020, Land 1,536
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 10,866
Gross Carrying Amount at December 31, 2020, Total 12,402
Accumulated Depreciation $ 8,861
Year(s) Acquired 1998
Arapaho Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 408
Initial Cost to Company, Land $ 5,226
Initial Cost to Company, Buildings and Improvements 10,661
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,833
Gross Carrying Amount at December 31, 2020, Land 5,226
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 15,494
Gross Carrying Amount at December 31, 2020, Total 20,720
Accumulated Depreciation $ 7,356
Year(s) Acquired 2013/2014
Richardson Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 117
Initial Cost to Company, Land $ 799
Initial Cost to Company, Buildings and Improvements 3,568
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,107
Gross Carrying Amount at December 31, 2020, Land 799
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 6,675
Gross Carrying Amount at December 31, 2020, Total 7,474
Accumulated Depreciation $ 5,665
Year(s) Acquired 1998
Bren Mar [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 113
Initial Cost to Company, Land $ 2,197
Initial Cost to Company, Buildings and Improvements 5,380
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 4,370
Gross Carrying Amount at December 31, 2020, Land 2,197
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,750
Gross Carrying Amount at December 31, 2020, Total 11,947
Accumulated Depreciation $ 7,813
Year(s) Acquired 1997
Eisenhower [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 95
Initial Cost to Company, Land $ 1,440
Initial Cost to Company, Buildings and Improvements 3,635
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,783
Gross Carrying Amount at December 31, 2020, Land 1,440
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 6,418
Gross Carrying Amount at December 31, 2020, Total 7,858
Accumulated Depreciation $ 5,387
Year(s) Acquired 1997
Pickett Industrial Park [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 246
Initial Cost to Company, Land $ 19,138
Initial Cost to Company, Buildings and Improvements 23,967
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 1,104
Gross Carrying Amount at December 31, 2020, Land 19,138
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 25,071
Gross Carrying Amount at December 31, 2020, Total 44,209
Accumulated Depreciation $ 190
Year(s) Acquired 2020
Beaumont [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 107
Initial Cost to Company, Land $ 4,736
Initial Cost to Company, Buildings and Improvements 11,051
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,122
Gross Carrying Amount at December 31, 2020, Land 4,736
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 13,173
Gross Carrying Amount at December 31, 2020, Total 17,909
Accumulated Depreciation $ 8,720
Year(s) Acquired 2006
Dulles South [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 99
Initial Cost to Company, Land $ 1,373
Initial Cost to Company, Buildings and Improvements 6,810
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 3,022
Gross Carrying Amount at December 31, 2020, Land 1,373
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,832
Gross Carrying Amount at December 31, 2020, Total 11,205
Accumulated Depreciation $ 7,578
Year(s) Acquired 1999
Lafayette [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 197
Initial Cost to Company, Land $ 1,680
Initial Cost to Company, Buildings and Improvements 13,398
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,829
Gross Carrying Amount at December 31, 2020, Land 1,680
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 20,227
Gross Carrying Amount at December 31, 2020, Total 21,907
Accumulated Depreciation $ 15,420
Year(s) Acquired 1999/2000
Park East [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 198
Initial Cost to Company, Land $ 3,851
Initial Cost to Company, Buildings and Improvements 18,029
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 11,717
Gross Carrying Amount at December 31, 2020, Land 3,851
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 29,746
Gross Carrying Amount at December 31, 2020, Total 33,597
Accumulated Depreciation $ 23,052
Year(s) Acquired 1999
Fair Oaks Business Park [Member] | Commercial Real Estate [Member] | Fairfax, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 290
Initial Cost to Company, Land $ 13,598
Initial Cost to Company, Buildings and Improvements 36,232
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 10,212
Gross Carrying Amount at December 31, 2020, Land 13,598
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 46,444
Gross Carrying Amount at December 31, 2020, Total 60,042
Accumulated Depreciation $ 30,744
Year(s) Acquired 2004/2007
Monroe [Member] | Commercial Real Estate [Member] | Herndon, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 244
Initial Cost to Company, Land $ 6,737
Initial Cost to Company, Buildings and Improvements 18,911
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 12,116
Gross Carrying Amount at December 31, 2020, Land 6,737
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 31,027
Gross Carrying Amount at December 31, 2020, Total 37,764
Accumulated Depreciation $ 24,646
Year(s) Acquired 1997/1999
Gunston [Member] | Commercial Real Estate [Member] | Lorton, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 247
Initial Cost to Company, Land $ 4,146
Initial Cost to Company, Buildings and Improvements 17,872
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 12,843
Gross Carrying Amount at December 31, 2020, Land 4,146
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 30,715
Gross Carrying Amount at December 31, 2020, Total 34,861
Accumulated Depreciation $ 22,552
Year(s) Acquired 1998
The Mile [Member] | Commercial Real Estate [Member] | McLean, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 628
Initial Cost to Company, Land $ 38,279
Initial Cost to Company, Buildings and Improvements 83,596
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 26,074
Gross Carrying Amount at December 31, 2020, Land 38,279
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 109,670
Gross Carrying Amount at December 31, 2020, Total 147,949
Accumulated Depreciation $ 54,633
Year(s) Acquired 2010/2011
Prosperity at Merrifield [Member] | Commercial Real Estate [Member] | Merrifield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 659
Initial Cost to Company, Land $ 23,147
Initial Cost to Company, Buildings and Improvements 67,575
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 39,260
Gross Carrying Amount at December 31, 2020, Land 23,147
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 106,835
Gross Carrying Amount at December 31, 2020, Total 129,982
Accumulated Depreciation $ 75,766
Year(s) Acquired 2001
Alban Road [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 150
Initial Cost to Company, Land $ 1,935
Initial Cost to Company, Buildings and Improvements 4,736
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 5,193
Gross Carrying Amount at December 31, 2020, Land 1,935
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 9,929
Gross Carrying Amount at December 31, 2020, Total 11,864
Accumulated Depreciation $ 8,244
Year(s) Acquired 1997
I-95 [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 210
Initial Cost to Company, Land $ 3,535
Initial Cost to Company, Buildings and Improvements 15,672
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 14,912
Gross Carrying Amount at December 31, 2020, Land 3,535
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 30,584
Gross Carrying Amount at December 31, 2020, Total 34,119
Accumulated Depreciation $ 24,387
Year(s) Acquired 2000
Fullterton Road Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 243
Initial Cost to Company, Land $ 7,438
Initial Cost to Company, Buildings and Improvements 24,971
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 803
Gross Carrying Amount at December 31, 2020, Land 7,438
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 25,774
Gross Carrying Amount at December 31, 2020, Total 33,212
Accumulated Depreciation $ 2,882
Year(s) Acquired 2018
Northern Virginia Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 814
Initial Cost to Company, Land $ 18,369
Initial Cost to Company, Buildings and Improvements 87,258
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 6,570
Gross Carrying Amount at December 31, 2020, Land 18,369
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 93,828
Gross Carrying Amount at December 31, 2020, Total 112,197
Accumulated Depreciation $ 10,163
Year(s) Acquired 2018
Northpointe [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 147
Initial Cost to Company, Land $ 2,767
Initial Cost to Company, Buildings and Improvements 8,778
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 5,029
Gross Carrying Amount at December 31, 2020, Land 2,767
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 13,807
Gross Carrying Amount at December 31, 2020, Total 16,574
Accumulated Depreciation $ 11,549
Year(s) Acquired 1997/1998
Shaw Road [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 149
Initial Cost to Company, Land $ 2,969
Initial Cost to Company, Buildings and Improvements 10,008
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 5,033
Gross Carrying Amount at December 31, 2020, Land 2,969
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 15,041
Gross Carrying Amount at December 31, 2020, Total 18,010
Accumulated Depreciation $ 12,614
Year(s) Acquired 1998
Tysons Corporate Center [Member] | Commercial Real Estate [Member] | Vienna, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 270
Initial Cost to Company, Land $ 9,885
Initial Cost to Company, Buildings and Improvements 25,302
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 10,751
Gross Carrying Amount at December 31, 2020, Land 9,885
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 36,053
Gross Carrying Amount at December 31, 2020, Total 45,938
Accumulated Depreciation $ 17,853
Year(s) Acquired 2010
Woodbridge [Member] | Commercial Real Estate [Member] | Woodbridge, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 114
Initial Cost to Company, Land $ 1,350
Initial Cost to Company, Buildings and Improvements 3,398
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 2,316
Gross Carrying Amount at December 31, 2020, Land 1,350
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 5,714
Gross Carrying Amount at December 31, 2020, Total 7,064
Accumulated Depreciation $ 4,672
Year(s) Acquired 1997
212th Business Park [Member] | Commercial Real Estate [Member] | Kent, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 951
Initial Cost to Company, Land $ 19,573
Initial Cost to Company, Buildings and Improvements 17,695
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 12,915
Gross Carrying Amount at December 31, 2020, Land 19,573
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 30,610
Gross Carrying Amount at December 31, 2020, Total 50,183
Accumulated Depreciation $ 14,093
Year(s) Acquired 2012
Overlake [Member] | Commercial Real Estate [Member] | Redmond, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 371
Initial Cost to Company, Land $ 20,906
Initial Cost to Company, Buildings and Improvements 38,522
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 7,566
Gross Carrying Amount at December 31, 2020, Land 20,906
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 46,088
Gross Carrying Amount at December 31, 2020, Total 66,994
Accumulated Depreciation $ 31,674
Year(s) Acquired 2007
Renton [Member] | Commercial Real Estate [Member] | Renton, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Square Feet | ft² 28
Initial Cost to Company, Land $ 330
Initial Cost to Company, Buildings and Improvements 889
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 739
Gross Carrying Amount at December 31, 2020, Land 330
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 1,628
Gross Carrying Amount at December 31, 2020, Total 1,958
Accumulated Depreciation $ 1,297
Year(s) Acquired 1997
Highgate at the Mile [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Number of units of Real Estate Property | property 395
Highgate at the Mile [Member] | Multifamily [Member] | McLean, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Number of units of Real Estate Property | property 395
Initial Cost to Company, Land $ 21,814
Initial Cost to Company, Buildings and Improvements 84,923
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements 37
Gross Carrying Amount at December 31, 2020, Land 21,814
Gross Carrying Amount at December 31, 2020, Buildings and Improvements 84,960
Gross Carrying Amount at December 31, 2020, Total 106,774
Accumulated Depreciation $ 7,927
Year(s) Acquired 2018
Minimum [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Ground leases expiration date 2029
Minimum [Member] | Buena Park Industrial Center [Member] | Commercial Real Estate [Member] | Buena Park, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Carson [Member] | Commercial Real Estate [Member] | Carson, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Cerritos Business Center [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Cerritos/Edwards [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Concord Business Park [Member] | Commercial Real Estate [Member] | Concord, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Culver City [Member] | Commercial Real Estate [Member] | Culver City, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Bayview Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Christy Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Industrial Drive Distribution Center [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Bay Center Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Cabot Distribution Center [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Diablo Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Eden Landing [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Hayward Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Huntwood Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Parkway Commerce [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | La Mirada Commerce Center [Member] | Commercial Real Estate [Member] | La Mirada, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Laguna Hills Commerce Center [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Plaza Del Lago [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Canada Business Center [Member] | Commercial Real Estate [Member] | Lake Forest, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Dixon Landing Business Park [Member] | Commercial Real Estate [Member] | Milpitas, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Monterey/Calle [Member] | Commercial Real Estate [Member] | Monterey, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Monterey Park [Member] | Commercial Real Estate [Member] | Monterey Park, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Port Of Oakland [Member] | Commercial Real Estate [Member] | Oakland, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Kearney Mesa [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Lusk [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Rose Canyon Business Park [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Charcot Business Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Las Plumas [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Little Orchard Distribution Center [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Montague Industrial Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Oakland Road [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Rogers Ave [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Doolittle Business Park [Member] | Commercial Real Estate [Member] | San Leandro, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Bayshore Corporate Center [Member] | Commercial Real Estate [Member] | San Mateo, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | San Ramon/Norris Canyon [Member] | Commercial Real Estate [Member] | San Ramon, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Commerce Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Santa Clara Tech Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | San Tomas Business Center [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Walsh At Lafayette [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Hathaway Industrial Park [Member] | Commercial Real Estate [Member] | Santa Fe Springs, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Signal Hill [Member] | Commercial Real Estate [Member] | Signal Hill, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Airport Boulevard [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | South San Francisco/Produce [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Studio City/Ventura [Member] | Commercial Real Estate [Member] | Studio City, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Kifer Industrial Park [Member] | Commercial Real Estate [Member] | Sunnyvale, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Torrance [Member] | Commercial Real Estate [Member] | Torrance, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Boca Commerce [Member] | Commercial Real Estate [Member] | Boca Raton, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | MICC [Member] | Commercial Real Estate [Member] | Miami, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Wellington [Member] | Commercial Real Estate [Member] | Wellington, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Ammendale [Member] | Commercial Real Estate [Member] | Beltsville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Gaithersburgh/Christopher [Member] | Commercial Real Estate [Member] | Gaithersburg, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Gude Drive (Land) [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Parklawn Business Park [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | The Grove 270 [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Ben White [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Lamar Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | McKalla [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | McNeil [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Rutland [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Waterford [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Braker Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Mopac Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Southpark Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Valwood Business Center [Member] | Commercial Real Estate [Member] | Carrolton, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Northway Plaza [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Springlake Business Center [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Westwood Business Park [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Eastgate [Member] | Commercial Real Estate [Member] | Garland, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Freeport Business Park [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | NFTZ [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Ground leases expiration date 2029
Minimum [Member] | Royal Tech [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | La Prada [Member] | Commercial Real Estate [Member] | Mesquite, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | The Summit [Member] | Commercial Real Estate [Member] | Plano, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Arapaho Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Richardson Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Bren Mar [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Eisenhower [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Pickett Industrial Park [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Beaumont [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Dulles South [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Lafayette [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Park East [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Fair Oaks Business Park [Member] | Commercial Real Estate [Member] | Fairfax, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Monroe [Member] | Commercial Real Estate [Member] | Herndon, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Gunston [Member] | Commercial Real Estate [Member] | Lorton, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | The Mile [Member] | Commercial Real Estate [Member] | McLean, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Prosperity at Merrifield [Member] | Commercial Real Estate [Member] | Merrifield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Alban Road [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | I-95 [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Fullterton Road Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Northern Virginia Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Northpointe [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Shaw Road [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Tysons Corporate Center [Member] | Commercial Real Estate [Member] | Vienna, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Woodbridge [Member] | Commercial Real Estate [Member] | Woodbridge, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | 212th Business Park [Member] | Commercial Real Estate [Member] | Kent, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Overlake [Member] | Commercial Real Estate [Member] | Redmond, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Renton [Member] | Commercial Real Estate [Member] | Renton, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Minimum [Member] | Highgate at the Mile [Member] | Multifamily [Member] | McLean, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 5 years
Maximum [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Ground leases expiration date 2030
Maximum [Member] | Buena Park Industrial Center [Member] | Commercial Real Estate [Member] | Buena Park, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Carson [Member] | Commercial Real Estate [Member] | Carson, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Cerritos Business Center [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Cerritos/Edwards [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Concord Business Park [Member] | Commercial Real Estate [Member] | Concord, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Culver City [Member] | Commercial Real Estate [Member] | Culver City, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Bayview Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Christy Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Industrial Drive Distribution Center [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Bay Center Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Cabot Distribution Center [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Diablo Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Eden Landing [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Hayward Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Huntwood Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Parkway Commerce [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | La Mirada Commerce Center [Member] | Commercial Real Estate [Member] | La Mirada, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Laguna Hills Commerce Center [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Plaza Del Lago [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Canada Business Center [Member] | Commercial Real Estate [Member] | Lake Forest, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Dixon Landing Business Park [Member] | Commercial Real Estate [Member] | Milpitas, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Monterey/Calle [Member] | Commercial Real Estate [Member] | Monterey, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Monterey Park [Member] | Commercial Real Estate [Member] | Monterey Park, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Port Of Oakland [Member] | Commercial Real Estate [Member] | Oakland, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Kearney Mesa [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Lusk [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Rose Canyon Business Park [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Charcot Business Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Las Plumas [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Little Orchard Distribution Center [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Montague Industrial Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Oakland Road [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Rogers Ave [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Doolittle Business Park [Member] | Commercial Real Estate [Member] | San Leandro, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Bayshore Corporate Center [Member] | Commercial Real Estate [Member] | San Mateo, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | San Ramon/Norris Canyon [Member] | Commercial Real Estate [Member] | San Ramon, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Commerce Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Santa Clara Tech Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | San Tomas Business Center [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Walsh At Lafayette [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Hathaway Industrial Park [Member] | Commercial Real Estate [Member] | Santa Fe Springs, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Signal Hill [Member] | Commercial Real Estate [Member] | Signal Hill, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Airport Boulevard [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | South San Francisco/Produce [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Studio City/Ventura [Member] | Commercial Real Estate [Member] | Studio City, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Kifer Industrial Park [Member] | Commercial Real Estate [Member] | Sunnyvale, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Torrance [Member] | Commercial Real Estate [Member] | Torrance, CA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Boca Commerce [Member] | Commercial Real Estate [Member] | Boca Raton, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | MICC [Member] | Commercial Real Estate [Member] | Miami, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Wellington [Member] | Commercial Real Estate [Member] | Wellington, FL [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Ammendale [Member] | Commercial Real Estate [Member] | Beltsville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Gaithersburgh/Christopher [Member] | Commercial Real Estate [Member] | Gaithersburg, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Gude Drive (Land) [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Parklawn Business Park [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | The Grove 270 [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Ben White [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Lamar Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | McKalla [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | McNeil [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Rutland [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Waterford [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Braker Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Mopac Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Southpark Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Valwood Business Center [Member] | Commercial Real Estate [Member] | Carrolton, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Northway Plaza [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Springlake Business Center [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Westwood Business Park [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Eastgate [Member] | Commercial Real Estate [Member] | Garland, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Freeport Business Park [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | NFTZ [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Ground leases expiration date 2030
Maximum [Member] | Royal Tech [Member] | Commercial Real Estate [Member] | Irving, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | La Prada [Member] | Commercial Real Estate [Member] | Mesquite, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | The Summit [Member] | Commercial Real Estate [Member] | Plano, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Arapaho Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Richardson Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Bren Mar [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Eisenhower [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Pickett Industrial Park [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Beaumont [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Dulles South [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Lafayette [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Park East [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Fair Oaks Business Park [Member] | Commercial Real Estate [Member] | Fairfax, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Monroe [Member] | Commercial Real Estate [Member] | Herndon, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Gunston [Member] | Commercial Real Estate [Member] | Lorton, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | The Mile [Member] | Commercial Real Estate [Member] | McLean, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Prosperity at Merrifield [Member] | Commercial Real Estate [Member] | Merrifield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Alban Road [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | I-95 [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Fullterton Road Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Northern Virginia Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Northpointe [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Shaw Road [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Tysons Corporate Center [Member] | Commercial Real Estate [Member] | Vienna, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Woodbridge [Member] | Commercial Real Estate [Member] | Woodbridge, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | 212th Business Park [Member] | Commercial Real Estate [Member] | Kent, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Overlake [Member] | Commercial Real Estate [Member] | Redmond, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Renton [Member] | Commercial Real Estate [Member] | Renton, WA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 30 years
Maximum [Member] | Highgate at the Mile [Member] | Multifamily [Member] | McLean, VA [Member]  
Real Estate and Accumulated Depreciation [Line Items]  
Depreciable Lives (Years) 40 years