Quarterly report pursuant to Section 13 or 15(d)

Summary Of Significant Accounting Policies (Narrative) (Details)

v3.21.2
Summary Of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
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Sep. 30, 2021
USD ($)
customer
segment
property
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Aug. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]              
Common units in operating partnership | shares     7,305,355        
Land and building held for development, net $ 62,467,000   $ 62,467,000   $ 37,922,000 $ 62,467,000  
Cash and cash equivalents maximum benchmark (in months)     3 months        
Minimum expected future benefit period on expenditures cost to be capitalized and depreciated (in years)     2 years        
Minimum expected future benefit period on transaction cost to be capitalized and depreciated (in years)     1 year        
Length of time criteria for expected sale of assets to be classified as properties held for disposition     12 months        
Below market lease, net 2,800,000   $ 2,800,000   2,200,000 2,800,000  
Below market leases, accumulated amortization 12,800,000   12,800,000   12,200,000 12,800,000  
Impairment on assets     0 $ 0      
Operating lease, right-of-use asset $ 1,400,000   $ 1,400,000   1,500,000 $ 1,400,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets   Other Assets     Other Assets  
Operating lease, liability $ 1,400,000   $ 1,400,000   1,500,000 $ 1,400,000  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities   Accounts Payable and Accrued Liabilities     Accounts Payable and Accrued Liabilities  
Accumulated amortization $ 300,000   $ 300,000   200,000 $ 300,000  
Accounts receivable, write-off 0.0   0.0        
Deferred rent receivable, write-off 100,000   300,000        
Rental income 110,448,000 $ 103,760,000 327,859,000 310,535,000      
Rental income, operating leases 83,600,000 79,400,000 249,400,000 238,300,000      
Rental income, variable lease payments 26,800,000 24,400,000 78,400,000 $ 72,200,000      
Income tax expense     0        
Tax benefit for uncertain tax positions     $ 0   0    
Number of operating segments | segment     2        
Number of reportable segments | segment     1        
Gross real estate investment property 3,072,157,000   $ 3,072,157,000   2,924,660,000 3,072,157,000  
Properties held for sale, net 46,811,000   $ 46,811,000   75,138,000 46,811,000  
Reclassification [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Land and building held for development, net         (5,100,000)    
Gross real estate investment property         (70,000,000.0)    
Properties held for sale, net         75,100,000    
COVID-19 [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Deferral agreement, number of customers | customer     340        
Deferral agreement, percentage of customers on a percentage of total rental income basis     9.60%        
Deferred rent receivable 100,000 1,700,000 $ 400,000     6,100,000  
Rent receivable abated 100,000 $ 300,000 300,000     1,600,000  
Deferred payments received     $ 4,500,000        
Collection rate percentage on deferral repayments     99.90%        
Above Market Leases [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Finite-lived intangible assets, net 800,000   $ 800,000   1,200,000 800,000  
Finite-lived intangible assets, accumulated amortization (11,500,000)   (11,500,000)   (11,100,000) (11,500,000)  
Acquired In Place Leases [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Finite-lived intangible assets, net 6,400,000   6,400,000   5,300,000 6,400,000  
Finite-lived intangible assets, accumulated amortization $ 9,400,000   $ 9,400,000   7,200,000 $ 9,400,000  
Minimum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful life (in years)     5 years        
Operating lease, expiration date     2029        
Operating lease, remaining lease term     8 years        
Maximum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful life (in years)     30 years        
Operating lease, expiration date     2030        
Operating lease, remaining lease term     8 years 3 months 18 days        
Highgate at the Mile [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Number of units developed | property     395        
Highgate at the Mile [Member] | JV Partner [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Consolidated entity ownership percentage 5.00%   5.00%     5.00%  
Brentford at The Mile [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Number of units developed | property     411        
Land and building held for development, net $ 5,100,000   $ 5,100,000     $ 5,100,000 $ 5,100,000
Brentford at The Mile [Member] | JV Partner [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Consolidated entity ownership percentage 1.80%   1.80%     1.80%  
Investment in Joint Venture [Member] | Highgate at the Mile [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Consolidated entity ownership percentage 95.00%   95.00%     95.00%  
Investment in Joint Venture [Member] | Brentford at The Mile [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Consolidated entity ownership percentage 98.20%   98.20%     98.20%  
Land and building held for development, net $ 46,500,000   $ 46,500,000   $ 15,100,000 $ 46,500,000