Annual report pursuant to Section 13 and 15(d)

Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details)

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Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property Subject to or Available for Operating Lease [Line Items]    
Year one $ 115,256,000 $ 117,228,000
Year two 114,355,000 114,101,000
Year three 98,374,000 108,406,000
Year four 94,042,000 92,605,000
Year Five 91,297,000 88,309,000
2026 and thereafter 416,712,000 462,920,000
Total $ 930,036,000 $ 983,569,000
Tenant Leases [Member]    
Property Subject to or Available for Operating Lease [Line Items]    
Operating leases with various expiration dates through year 2036  
Multi-Family Properties [Member]    
Property Subject to or Available for Operating Lease [Line Items]    
Lease period 1 year