OTHER ASSETS AND LIABILITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Prepaid Expenses and Other Assets
Special Improvement District Receivable	$ 39,659,000	$ 40,580,000
Other receivables	2,346,000	4,181,000
Federal income tax receivable	5,367,000	5,393,000
Prepaid expenses	4,757,000	6,507,000
Condominium deposits	19,616,000
Security and escrow deposits	12,865,000	17,266,000
Uncertain tax position asset	12,801,000	11,935,000
Intangibles	3,714,000	3,074,000
Other	8,592,000	8,466,000
Total prepaid expenses and other assets	143,470,000	130,961,000
Accounts Payable and Accrued Expenses
Construction payable	17,501,000	10,241,000
Accounts payable and accrued expenses	39,634,000	43,764,000
Condominium deposits	19,616,000
Membership deposits	20,248,000	16,033,000
Deferred gains/income	7,767,000	5,739,000
Accrued interest	2,425,000	2,747,000
Accrued real estate taxes	6,622,000	3,439,000
Tenant and other deposits	8,096,000	5,966,000
Insurance reserve	9,037,000	6,939,000
Accrued payroll and other employee liabilities	11,514,000	9,658,000
Interest rate swaps	7,183,000	4,367,000
Special Assessement	2,868,000	2,234,000
Other	15,420,000	15,973,000
Total accounts payable and accrued expenses	170,521,000	129,848,000
Increase in interest rate swap liability	2,800,000
Collection of pre-sales condominium deposits	19,600,000
4 Waterway and 9303 New Trails
Prepaid Expenses and Other Assets
Repayment of the conference center cash collateral	5,700,000
Utilization of tenant improvement escrow funds	3,800,000
70 Columbia Corporate Center
Prepaid Expenses and Other Assets
Increase in escrow deposits	4,200,000
20/25 Waterway Avenue and Millennium Waterway Apartment
Prepaid Expenses and Other Assets
Increase in escrow deposits	800,000
The Club at Carlton Woods
Accounts Payable and Accrued Expenses
Increase in membership deposits	4,200,000
Below-market ground leases
Prepaid Expenses and Other Assets
Net carrying amount	20,341,000	20,680,000
Above-market tenant leases
Prepaid Expenses and Other Assets
Net carrying amount	1,896,000	1,014,000
In-place value tenant leases
Prepaid Expenses and Other Assets
Net carrying amount	11,516,000	11,865,000
Above-market ground leases
Accounts Payable and Accrued Expenses
Net carrying amount	$ 2,590,000	$ 2,748,000