Transactions with General Partner and Its Affiliates (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amounts paid and/or accrued to the General Partner and its affiliates
Management fees	$ 252,344	$ 244,943	$ 241,579
Restoration fees	40	299	479
General Partner [Member]
Amounts paid and/or accrued to the General Partner and its affiliates
Management fees	252,344	244,943	241,579
Restoration fees	40	299	497
Overhead allowance	20,356	19,782	19,524
Advisory fee on sale	0	14,250	0
Outsourced XBRL Fees	6,200	0	0
Leasing commissions	8,405	5,346	0
Reimbursement for out-of-pocket expenses	6,849	5,822	5,273
Cash distribution	2,878	3,081	3,260
Total general partner	$ 297,072	$ 293,523	$ 270,133