Annual report pursuant to Section 13 and 15(d)

Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details)

v3.22.0.1
Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details)
12 Months Ended 24 Months Ended
Dec. 31, 2021
USD ($)
segment
property
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
customer
Aug. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Common units in operating partnership | shares 7,305,355          
Land and building held for development, net $ 78,990,000 $ 37,922,000     $ 78,990,000  
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          
Below market lease, net $ 2,800,000 2,200,000     2,800,000  
Below market leases, accumulated amortization 13,100,000 12,200,000     13,100,000  
Impairment on assets   0 $ 0 $ 0    
Operating lease, right-of-use asset $ 1,300,000 $ 1,500,000     $ 1,300,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets     Other Assets  
Operating lease, liability $ 1,300,000 $ 1,500,000     $ 1,300,000  
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 $ 200,000     $ 300,000  
Accounts receivable, write-off 100,000 1,600,000 1,100,000      
Deferred rent receivable, write-off 300,000 3,100,000 500,000      
Rental income 438,703,000 415,623,000 429,846,000      
Rental income, operating leases 333,900,000 319,200,000 333,300,000      
Rental income, variable lease payments 104,800,000 96,400,000 $ 96,500,000      
Income tax expense 0          
Tax benefit for uncertain tax positions $ 0 0        
Number of operating segments | segment 2          
Number of reportable segments | segment 1          
Deferred rent receivable   5,700,000        
Rent receivable abated $ 300,000          
Gross real estate investment property 3,106,482,000 2,924,660,000     3,106,482,000  
Properties held for sale, net 33,609,000 75,138,000     $ 33,609,000  
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         317  
Deferral agreement, percentage of customers on a percentage of total rental income basis         9.50%  
Deferred rent receivable 500,000       $ 6,200,000  
Rent receivable abated   1,300,000     1,600,000  
Deferred payments received         $ 5,300,000  
Collection rate percentage on deferral repayments         99.80%  
Deferred payments to be repaid thereafter         $ 900,000  
Above Market Leases [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Finite-lived intangible assets, net 600,000 1,200,000     600,000  
Finite-lived intangible assets, accumulated amortization (11,600,000) (11,100,000)     (11,600,000)  
Acquired In Place Leases [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Finite-lived intangible assets, net 6,000,000.0 5,300,000     6,000,000.0  
Finite-lived intangible assets, accumulated amortization $ 10,500,000 7,200,000     $ 10,500,000  
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 7 years 9 months 18 days          
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 1 month 6 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%  
Brentford at The Mile [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of units developed | property 411          
Gross real estate investment property $ 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%  
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%  
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%  
Land and building held for development, net $ 59,900,000 $ 15,100,000     $ 59,900,000