Annual report pursuant to Section 13 and 15(d)

Real Estate Facilities (Narrative) (Details)

v3.22.0.1
Real Estate Facilities (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 30, 2021
USD ($)
ft²
Dec. 29, 2021
USD ($)
ft²
Oct. 19, 2021
USD ($)
ft²
Sep. 17, 2021
USD ($)
ft²
Jul. 16, 2021
USD ($)
ft²
Jun. 17, 2021
USD ($)
ft²
Sep. 16, 2020
USD ($)
ft²
item
Jan. 07, 2020
USD ($)
ft²
Oct. 08, 2019
USD ($)
ft²
Dec. 31, 2021
USD ($)
a
ft²
property
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Nov. 18, 2021
USD ($)
ft²
Sep. 01, 2021
USD ($)
ft²
Oct. 28, 2020
USD ($)
ft²
Jan. 10, 2020
USD ($)
ft²
Dec. 20, 2019
USD ($)
ft²
Sep. 05, 2019
USD ($)
ft²
Apr. 18, 2019
USD ($)
ft²
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                   27,712,000                  
Federal income tax basis of real estate facilities                   $ 1,700,000                  
Committed transaction costs for executed leases                   9,800                  
Purchase price                   148,868 $ 60,095 $ 134,942              
Gross real estate investment property                   3,106,482 2,924,660                
Proceeds from sale of real estate facilities                   400,955 40,674 144,599              
Gain on sale of real estate facilities                   $ 359,875 $ 27,273 $ 16,644              
Plano Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                         141,000            
Purchase price                         $ 25,600            
Alexandria Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                             246,000        
Purchase price                             $ 46,600        
Grapevine Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                           718,000          
Purchase price                           $ 123,300          
La Mirada Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                               73,000      
Purchase price                               $ 13,500      
Santa Clara Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                                 79,000    
Purchase price                                 $ 16,800    
Santa Fe Springs Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                                   543,000  
Purchase price                                   $ 104,300  
Signal Hill Acquisition [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                                     74,000
Purchase price                                     $ 13,800
Metro Park North [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²               113,000                      
Proceeds from sale of real estate facilities               $ 29,300                      
Gain on sale of real estate facilities               $ 19,600                      
Rockville and Silver Spring Business Parks [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                 1,300,000                    
Proceeds from sale of real estate facilities                 $ 144,600                    
Gain on sale of real estate facilities                 $ 16,600                    
Highgate at the Mile [Member]                                      
Real Estate Facilities [Line Items]                                      
Number of units developed | property                   395                  
Area of land (in acres) | a                   5                  
Highgate at the Mile [Member] | Investment in Joint Venture [Member]                                      
Real Estate Facilities [Line Items]                                      
Economic interest in joint venture, percentage                   95.00%                  
Highgate at the Mile [Member] | JV Partner [Member]                                      
Real Estate Facilities [Line Items]                                      
Economic interest in joint venture, percentage                   5.00%                  
Beltsville, MD [Member] | Industrial Property [Member]                                      
Real Estate Facilities [Line Items]                                      
Area of real estate property (in square feet) | ft² 53,000                                    
Proceeds from sale of real estate facilities $ 4,500                                    
Gain on sale of real estate facilities $ 3,200                                    
Irving, TX [Member] | Industrial Property [Member]                                      
Real Estate Facilities [Line Items]                                      
Area of real estate property (in square feet) | ft²                   83,000                  
Development costs incurred                   $ 8,100                  
Gross real estate investment property                   $ 9,100                  
Irving, TX [Member] | Industrial-Flex Business Park [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                     772,000                
Area of real estate property (in square feet) | ft²   70,000   22,000                              
Proceeds from sale of real estate facilities   $ 8,800   $ 3,400                              
Gain on sale of real estate facilities   $ 6,300   $ 2,900                              
San Diego, CA [Member] | Industrial-Flex Business Park [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                     371,000                
Area of real estate property (in square feet) | ft²     371,000                                
Proceeds from sale of real estate facilities     $ 311,100                                
Gain on sale of real estate facilities     $ 301,300                                
Herndon, VA [Member] | Office Business Park [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                     244,000                
Area of real estate property (in square feet) | ft²         244,000                            
Proceeds from sale of real estate facilities         $ 40,500                            
Gain on sale of real estate facilities         $ 27,000                            
Chantilly, VA [Member] | Office Oriented Flex Business Park [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²                     198,000                
Area of real estate property (in square feet) | ft²           198,000                          
Proceeds from sale of real estate facilities           $ 32,600                          
Gain on sale of real estate facilities           $ 19,200                          
Redmond, WA [Member] | Industrial Property [Member]                                      
Real Estate Facilities [Line Items]                                      
Rentable area (in square feet) | ft²             40,000                        
Number of buildings sold | item             2                        
Proceeds from sale of real estate facilities             $ 11,400                        
Gain on sale of real estate facilities             $ 7,700                        
Kent, WA [Member] | Industrial Property [Member]                                      
Real Estate Facilities [Line Items]                                      
Area of real estate property (in square feet) | ft²                   83,000                  
Development costs incurred                   $ 2,200                  
Estimated development costs                   15,400                  
Contractual construction commitments                   $ 1,200                  
Boca Raton, FL [Member] | Industrial Property [Member]                                      
Real Estate Facilities [Line Items]                                      
Area of real estate property (in square feet) | ft²                   17,000                  
Development costs incurred                   $ 1,100                  
Estimated development costs                   4,000                  
Contractual construction commitments                   $ 2,900