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Mortgages Payable (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Accumulated amortization |  | $ 11,268,000 | $ 9,877,000
Debt costs, net of accumulated amortization |  | (2,715,000) | (4,003,000)
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs |  | 13,878,000 | 23,964,000
Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Value of Encumbered Asset(s) | [1] | 21,403,000 |
Outstanding Principal Balance |  | 13,987,000 | 24,097,000
Debt costs |  | (147,000) | (226,000)
Accumulated amortization |  | 38,000 | 93,000
Debt costs, net of accumulated amortization |  | (109,000) | (133,000)
Mortgages payable, including unamortized premium and net of unamortized debt costs |  | 13,878,000 | 23,964,000
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |
2017 |  | 596,000 |
2018 |  | 623,000 |
2019 |  | 652,000 |
2020 |  | 682,000 |
2021 |  | 716,000 |
Thereafter |  | 10,718,000 |
Mortgages payable, including unamortized premium and net of unamortized debt costs |  | 13,987,000 |
Mortgages | February 2004 |  |  |
Debt Instrument [Line Items] |  |  |
Initial Balance |  | $ 6,952,000 |
Interest Rate |  | 6.90% |
Carrying Value of Encumbered Asset(s) | [1] | $ 0 |
Outstanding Principal Balance |  | 0 | 848,000
Mortgages | June 2012 |  |  |
Debt Instrument [Line Items] |  |  |
Initial Balance | [2] | $ 6,850,000 |
Interest Rate | [2] | 5.75% |
Carrying Value of Encumbered Asset(s) | [1],[2] | $ 0 |
Outstanding Principal Balance | [2] | 0 | 5,890,000
Mortgages | September 2014 |  |  |
Debt Instrument [Line Items] |  |  |
Initial Balance | [2] | $ 2,957,000 |
Interest Rate | [2] | 6.40% |
Carrying Value of Encumbered Asset(s) | [1],[2] | $ 0 |
Outstanding Principal Balance | [2] | 0 | 2,804,000
Mortgages | November 2014 |  |  |
Debt Instrument [Line Items] |  |  |
Initial Balance | [2] | $ 15,151,000 |
Interest Rate | [2] | 5.23% |
Carrying Value of Encumbered Asset(s) | [1],[2] | $ 21,403,000 |
Outstanding Principal Balance | [2] | $ 13,987,000 | $ 14,555,000
[1] | Each loan is secured by a first mortgage lien on certain of the Properties. The carrying values of the assets at December 31, 2016.
[2] | Initial balance and outstanding principal balance includes unamortized premium.

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