Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Tenant and other receivables, allowance (in dollars)	$ 15,628	$ 12,981
Deferred rents receivable, allowance (in dollars)	28,017	30,834
Debt and preferred equity investments, discount (in dollars)	19,387	42,937
Debt and preferred equity investments, allowance (in dollars)	$ 41,800	$ 61,361
SL Green partners' capital, general partner common units outstanding	876	796
SL Green partners' capital, limited partner common units outstanding	84,830	77,511
Limited partner interests in Operating Partnership, limited partner common units outstanding	1,910	1,249
Series C preferred units
Preferred units, outstanding	11,700	11,700
Series D preferred units
Preferred units, outstanding	4,000	4,000