OTHER ASSETS AND LIABILITIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Prepaid Expenses and Other Assets
Special Improvement District Receivable	$ 39,666,000	$ 39,659,000
Other receivables	829,000	2,346,000
Federal income tax receivable	5,580,000	5,367,000
Prepaid expenses	6,497,000	4,757,000
Condominium deposits	33,349,000	19,616,000
Security and escrow deposits	10,356,000	12,865,000
Uncertain tax position asset	13,528,000	12,801,000
Intangibles	3,714,000	3,714,000
Other	8,145,000	8,592,000
Total prepaid expenses and other assets	154,237,000	143,470,000
Increase in condominium deposits	13,700,000
Decrease in security and escrow deposits	2,500,000
Accounts Payable and Accrued Expenses
Construction payable	18,249,000	17,501,000
Accounts payable and accrued expenses	52,504,000	39,634,000
Condominium deposits	33,349,000	19,616,000
Membership deposits	21,166,000	20,248,000
Deferred gains/income	7,445,000	7,767,000
Accrued interest	2,368,000	2,425,000
Accrued real estate taxes	3,883,000	6,622,000
Tenant and other deposits	9,906,000	8,096,000
Insurance reserve	4,876,000	9,037,000
Accrued payroll and other employee liabilities	5,889,000	11,514,000
Interest rate swaps	6,691,000	7,183,000
Special assessment	2,868,000	2,868,000
Other	16,098,000	15,420,000
Total accounts payable and accrued expenses	187,842,000	170,521,000
Increase in accounts payable and accrued expenses	12,900,000
Lease payment due in 2014 and 2015	3,300,000
Decrease in accrued payroll and other employee liabilities	5,600,000
70 Columbia Corporate Center
Prepaid Expenses and Other Assets
Utilization of escrow funds	2,100,000
Below-market ground leases
Prepaid Expenses and Other Assets
Net carrying amount	20,256,000	20,341,000
Above-market tenant leases
Prepaid Expenses and Other Assets
Net carrying amount	1,981,000	1,896,000
In-place value tenant leases
Prepaid Expenses and Other Assets
Net carrying amount	10,336,000	11,516,000
Above-market ground leases
Accounts Payable and Accrued Expenses
Net carrying amount	$ 2,550,000	$ 2,590,000