Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Land	$ 126,555	$ 107,171
Investment Building and Building Improvements	669,901	691,457
Real Estate Investment Property, Accumulated Depreciation	82,428	83,137
Cash and Cash Equivalents, at Carrying Value	36,986	28,033
Restricted Cash and Cash Equivalents	15,880	18,367
Accounts Receivable, Net	1,825	2,301
Deferred Costs, Noncurrent	6,208	4,875
Acquired Finite-lived Intangible Asset, Amount	41,125	33,909
Deferred Rent Receivables, Net	4,575	4,772
Prepaid Expense and Other Assets	1,419	1,118
Secured Debt	492,985	582,495
Accounts Payable and Accrued Liabilities	15,615	9,214
Interest Payable	2,033	4,265
Accrual for Taxes Other than Income Taxes	937	1,132
Variable Interest Entity
Land	32,593	32,593
Investment Building and Building Improvements	232,423	230,931
Real Estate Investment Property, Accumulated Depreciation	(28,027)	(22,143)
Cash and Cash Equivalents, at Carrying Value	2,500	2,462
Restricted Cash and Cash Equivalents	3,051	2,936
Accounts Receivable, Net	1,203	1,025
Deferred Costs, Noncurrent	783	952
Acquired Finite-lived Intangible Asset, Amount	4,548	5,058
Deferred Rent Receivables, Net	1,074	1,013
Prepaid Expense and Other Assets	364	345
Secured Debt	187,234	189,695
Accounts Payable and Accrued Liabilities	2,953	2,709
Interest Payable	909	921
Accrual for Taxes Other than Income Taxes	$ 638	$ 574
Class E Shares [Member]
Common stock, par value	$ 0.01
Common Stock, shares authorized	200,000,000
Common stock, shares issued	26,444,842	23,995,352
Common stock, shares outstanding	26,444,842	23,995,352
Class A Shares [Member]
Common stock, par value	$ 0.01
Common Stock, shares authorized	400,000,000
Common stock, shares issued	3,612,169
Common stock, shares outstanding	3,612,169
Class M Shares [Member]
Common stock, par value	$ 0.01
Common Stock, shares authorized	400,000,000
Common stock, shares issued	104,282
Common stock, shares outstanding	104,282