Annual report pursuant to Section 13 and 15(d)

Organization And Description Of Business (Narrative) (Details)

v3.20.4
Organization And Description Of Business (Narrative) (Details)
ft² in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2020
ft²
item
state
shares
Dec. 31, 2020
ft²
property
state
shares
Jan. 01, 2018
Organization And Description Of Business [Line Items]      
The Company's ownership percentage of the limited partnership 79.00% 79.00%  
Rentable area (in square feet) | ft² 27,728 27,728  
Number of states with rentable commercial space | state 6 6  
Number of parks | item 98    
Number of buildings | item 675    
Managed Properties [Member]      
Organization And Description Of Business [Line Items]      
Rentable area (in square feet) | ft² 400 400  
Highgate at the Mile [Member]      
Organization And Description Of Business [Line Items]      
Number of units to be developed | property   395  
Brentford at The Mile [Member]      
Organization And Description Of Business [Line Items]      
Number of units to be developed 411 411  
JV Partner [Member] | Highgate at the Mile [Member]      
Organization And Description Of Business [Line Items]      
Economic interest in joint venture, percentage 5.00% 5.00% 5.00%
JV Partner [Member] | Brentford at The Mile [Member]      
Organization And Description Of Business [Line Items]      
Economic interest in joint venture, percentage 1.80% 1.80%  
PS [Member]      
Organization And Description Of Business [Line Items]      
Shares owned by Public Storage | shares 7.2 7.2  
Affiliate's percent ownership of the Company's common equity 41.60% 41.60%  
Aggregate shares owned if partnership units are redeemed | shares 14.5 14.5  
Investment in Joint Venture [Member] | Highgate at the Mile [Member]      
Organization And Description Of Business [Line Items]      
Economic interest in joint venture, percentage 95.00% 95.00%  
Investment in Joint Venture [Member] | Brentford at The Mile [Member]      
Organization And Description Of Business [Line Items]      
Economic interest in joint venture, percentage 98.20% 98.20%