Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Rental Property Held for Sale, Net) (Narrative) (Details)

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Recent Transactions (Rental Property Held for Sale, Net) (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
ft²
item
property
Multi-Family Properties [Member]  
Real Estate Properties [Line Items]  
Number of units | item 5,032
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]  
Real Estate Properties [Line Items]  
Assets held for sale, Deferred charges and other assets $ 19,000
Assets held for sale, Unbilled rents receivable, net 39,000
Assets held for sale, Accounts payable, accrued expenses and other liabilities 35,000
Expected assets to be written off 47,000
Expected liabilities to be written off $ 12,000
East Brunswick, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member]  
Real Estate Properties [Line Items]  
Area of property (in square feet) | ft² 40,000
Number of properties held for sale | property 1
Estimated expected sales proceeds $ 3,500,000