Reportable Segments Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	$ 21,490	$ 21,216	$ 44,474	$ 43,252
Fee income, Net of Reimbursed Expenses	5,105	4,460	8,995	8,173
Residential Lot Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	89	4	474	100
Other Income	266	651	1,731	5,821
Third party management and leasing expenses	(2,254)	(1,871)	(4,253)	(3,716)
General and administrative expenses	5,645	6,133	12,268	13,533
Interest Expense	(5,875)	(7,358)	(12,143)	(14,902)
Depreciation and Amortization of Non Real Estate Assets	(223)	(372)	(587)	(935)
Separation expenses	(79)	(77)	(292)	(178)
Other nonoperating expense, including discontinued operations	(579)	(659)	(1,273)	(4,021)
Loss on extinguishment of debt	0	0	(94)	0
Funds from Operations from Unconsolidated Joint Ventures	4,748	4,970	9,595	10,144
Net Income Attributable to Noncontrolling Interest Excluding Gain on Sale of Property	(631)	(681)	(1,205)	(1,262)
(PROVISION) BENEFIT FOR INCOME TAXES FROM OPERATIONS	(33)	(27)	(60)	37
Dividends, Preferred Stock	(3,227)	(3,227)	(6,454)	(6,454)
Funds from Operations Available to Common Stockholders	13,152	10,896	26,640	19,018
Real Estate Depreciation and Amortization Including Company's Share of Joint Ventures	(15,022)	(15,661)	(31,575)	(31,315)
Impairment of Real Estate	0	0	(12,233)	(3,508)
Noncontrolling Interest Related to Gain on Sale of Depreciable Investment Property			2,043
Gain (Loss) on Sale of Depreciated Investment Properties	8,271	59	8,414	(266)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS	6,401	(4,706)	(6,711)	(12,563)
Office Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	16,741	15,458	33,676	30,709
Other Income		447		818
Funds from Operations from Unconsolidated Joint Ventures	2,709	2,685	5,709	5,449
Funds from Operations Available to Common Stockholders	19,450	18,590	39,385	36,976
Retail Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	4,749	4,847	10,797	10,582
Residential Lot Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties				50
Other Income	13	10	205	34
Funds from Operations from Unconsolidated Joint Ventures	2,176	2,125	4,286	4,366
Funds from Operations Available to Common Stockholders	6,938	6,982	15,288	15,032
Land [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	0	0	0	0
Fee income, Net of Reimbursed Expenses		56		91
Residential Lot Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	89	4	474	50
Funds from Operations from Unconsolidated Joint Ventures	(135)	127	(397)	279
Funds from Operations Available to Common Stockholders	(46)	187	77	420
Third Party Management [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	0	0	0	0
Fee income, Net of Reimbursed Expenses	3,676	2,396	6,086	4,236
Third party management and leasing expenses	(2,254)	(1,871)	(4,253)	(3,716)
Funds from Operations Available to Common Stockholders	1,422	525	1,833	520
All Other Segments [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	0	911	1	1,961
Fee income, Net of Reimbursed Expenses	1,429	2,008	2,909	3,846
Residential Lot Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties		0		0
Other Income	253	194	1,526	4,969
General and administrative expenses	5,645	6,133	12,268	13,533
Interest Expense	(5,875)	(7,358)	(12,143)	(14,902)
Depreciation and Amortization of Non Real Estate Assets	(223)	(372)	(587)	(935)
Separation expenses	(79)	(77)	(292)	(178)
Other nonoperating expense, including discontinued operations	(579)	(659)	(1,273)	(4,021)
Loss on extinguishment of debt			(94)
Funds from Operations from Unconsolidated Joint Ventures	(2)	33	(3)	50
Net Income Attributable to Noncontrolling Interest Excluding Gain on Sale of Property	(631)	(681)	(1,205)	(1,262)
(PROVISION) BENEFIT FOR INCOME TAXES FROM OPERATIONS	(33)	(27)	(60)	37
Dividends, Preferred Stock	(3,227)	(3,227)	(6,454)	(6,454)
Funds from Operations Available to Common Stockholders	(14,612)	(15,388)	(29,943)	(33,930)
Impairment of Real Estate				$ (3,508)