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.