Annual report pursuant to Section 13 and 15(d)

Investments in Unconsolidated Real Estate Joint Ventures - Management, Leasing and Marketing Fees (Details)

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Investments in Unconsolidated Real Estate Joint Ventures - Management, Leasing and Marketing Fees (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services $ 4,936 $ 5,419 $ 4,995
Management and Marketing Fee [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services 1,859 2,308 2,334
Leasing and other fees [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services 60 126 162
Expense reimbursements from joint ventures [Member]      
Schedule of Equity Method Investments [Line Items]      
Management, leasing and other services $ 3,017 $ 2,985 $ 2,499