Subsequent Events (Details) (USD $)	0 Months Ended	9 Months Ended				9 Months Ended			9 Months Ended		1 Months Ended				1 Months Ended			1 Months Ended				1 Months Ended
	Aug. 06, 2012	Sep. 30, 2012	Aug. 31, 2012	Dec. 31, 2011	Nov. 01, 2012 Share Repurchase [Member]	Sep. 30, 2012 Lake Brandt [Member] Non-recourse mortgage loan [Member]	Sep. 30, 2012 Lake Brandt [Member] Wholly-Owned Subsidiary [Member]	Nov. 01, 2012 Lake Brandt [Member] Wholly-Owned Subsidiary [Member] Unit	Sep. 30, 2012 Lake Brandt [Member] Wholly-Owned Subsidiary [Member] Non-recourse mortgage loan [Member]	Nov. 01, 2012 Lake Brandt [Member] Wholly-Owned Subsidiary [Member] Non-recourse mortgage loan [Member]	Oct. 31, 2012 Cerritos [Member] sqft	Oct. 04, 2012 Cerritos [Member]	Oct. 31, 2012 Cerritos [Member] Senior Note A [Member]	Oct. 31, 2012 Cerritos [Member] Senior Note B [Member]	Oct. 31, 2012 Newbury Refinance [Member] M	Oct. 02, 2012 Newbury Refinance [Member]	Oct. 02, 2012 Arboretum [Member]	Oct. 31, 2012 Broward financial center loan [Member]	Oct. 16, 2012 Seventh avenue [Member] sqft	Oct. 16, 2012 Seventh avenue [Member] Retail space [Member] sqft	Oct. 16, 2012 Seventh avenue [Member] Art led sign [Member] sqft	Oct. 31, 2012 Cedar realty trust [Member]	Oct. 18, 2012 Cedar realty trust [Member]
Subsequent Events (Textual) [Abstract]
Loan restructuring fee											$ 375,000
Modification agreement, property encumbered, notes, face amount													23,000,000	14,500,000
Principal amount of the loan																21,000,000
Leasing reserve											1,500,000
Maturity date of loan						Jan. 08, 2016									Oct. 02, 2022
Number of months for payment of interest															24
Office building area, square foot											187,000
Mortgage loan		21,000,000								13,600,000							1,657,000
Purchased membership interest, percentage												100.00%
Net proceeds after settlement expenses and repayments on existing debt															7,308,000
Interest rate on mortgage loans	9.00%								6.22%
Interest rate													5.0691%	6.6996%		3.95%
Debt instrument, interest rate		2.50%
Loan bears interest, description of variable rate basis		LIBOR plus 3%
Due date of the notes		Aug. 15, 2022
Aggregate amount of Senior Notes		86,250,000	86,250,000
Membership Dues Revenue, On-going											75,000
Area of property																			120,000	80,000	22,000
Investment commitment on preferred equity basis																			68,000,000
Initial contribution of investment committed																			29,000,000
Cash proceeds from loan originally purchased at par																		30,000,000
Gain or loss on repayment of loan																		0
Common stock, maximum number of shares available for sale																							6,250,716
Common stock, shares sold																							3,250,000
Net proceeds from sale of common shares																						17,160,000
Common shares held by trust																						3,000,716
Number of multi-family property acquired								284
Multi-family property unit acquired, aggregate purchase price								17,500,000
Percentage of space occupied							94.00%				53.00%
Repurchase of common shares outstanding		33,077,047		33,041,034	1,500,000
Return on additional funding to property, percentage											9.00%
Monthly interest payments											$ 12,000