Annual report pursuant to Section 13 and 15(d)

Real Estate Facilities (Narrative) (Details)

v3.20.4
Real Estate Facilities (Narrative) (Details)
$ in Thousands
12 Months Ended
Sep. 16, 2020
USD ($)
ft²
item
Jan. 07, 2020
USD ($)
ft²
Oct. 08, 2019
USD ($)
ft²
Oct. 31, 2018
USD ($)
ft²
item
Apr. 30, 2018
USD ($)
ft²
item
Apr. 18, 2018
USD ($)
ft²
item
Mar. 05, 2018
USD ($)
ft²
item
Dec. 31, 2020
USD ($)
a
ft²
item
property
Dec. 31, 2019
USD ($)
ft²
item
Dec. 31, 2018
USD ($)
Feb. 22, 2021
USD ($)
Oct. 28, 2020
USD ($)
ft²
Jan. 10, 2020
USD ($)
ft²
Dec. 20, 2019
USD ($)
ft²
Sep. 05, 2019
USD ($)
ft²
Apr. 18, 2019
USD ($)
ft²
Jun. 08, 2018
USD ($)
ft²
property
Jan. 01, 2018
Real Estate Facilities [Line Items]                                    
Rentable area (in square feet) | ft²               27,728,000                    
Federal income tax basis of real estate facilities               $ 1,700,000                    
Committed transaction costs for executed leases               9,100                    
Purchase price               $ 60,095 $ 134,942 $ 143,766                
Number of buildings | item               675                    
Proceeds from sale of real estate facilities               $ 40,674 144,599 145,097                
Gain on sale of real estate facilities               $ 27,273 $ 16,644 $ 93,484                
Alexandria Acquisition [Member]                                    
Real Estate Facilities [Line Items]                                    
Rentable area (in square feet) | ft²                       246,000            
Purchase price                       $ 46,600            
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    
Springfield Acquisition [Member]                                    
Real Estate Facilities [Line Items]                                    
Area of land (in acres) | ft²                                 1,100,000  
Number of parks acquired | property                                 2  
Purchase price                                 $ 143,800  
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                              
Corporate Pointe Business Park [Member]                                    
Real Estate Facilities [Line Items]                                    
Number of buildings sold | item             5                      
Area of real estate property (in square feet) | ft²             161,000                      
Proceeds from sale of real estate facilities             $ 41,700                      
Gain on sale of real estate facilities             $ 26,800                      
Orange County Business Center [Member]                                    
Real Estate Facilities [Line Items]                                    
Number of buildings sold | item           5                        
Area of real estate property (in square feet) | ft²           437,000                        
Proceeds from sale of real estate facilities           $ 73,300                        
Gain on sale of real estate facilities           $ 50,600                        
Northgate Business Park [Member]                                    
Real Estate Facilities [Line Items]                                    
Number of buildings sold | item         7                          
Area of real estate property (in square feet) | ft²         194,000                          
Proceeds from sale of real estate facilities         $ 11,800                          
Gain on sale of real estate facilities         $ 7,900                          
Orangewood Office Park [Member]                                    
Real Estate Facilities [Line Items]                                    
Number of buildings sold | item       2                            
Area of real estate property (in square feet) | ft²       107,000                            
Proceeds from sale of real estate facilities       $ 18,300                            
Gain on sale of real estate facilities       $ 8,200                            
Industrial Property [Member]                                    
Real Estate Facilities [Line Items]                                    
Area of real estate property (in square feet) | ft²               83,000                    
Development costs incurred               $ 7,800                    
Industrial Property [Member] | Subsequent Event [Member]                                    
Real Estate Facilities [Line Items]                                    
Development costs incurred                     $ 300              
Properties Held for Sale [Member]                                    
Real Estate Facilities [Line Items]                                    
Rentable area (in square feet) | ft²                 40,000                  
Number of buildings | item                 2                  
Highgate at the Mile [Member]                                    
Real Estate Facilities [Line Items]                                    
Number of units to be 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%                   5.00%
Redmond, WA [Member] | Industrial Property [Member]                                    
Real Estate Facilities [Line Items]                                    
Rentable area (in square feet) | ft² 40,000                                  
Number of buildings | item 2                                  
Proceeds from sale of real estate facilities $ 11,400                                  
Gain on sale of real estate facilities $ 7,700