Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	$ 22,988	$ 22,036
Fee income, net of reimbursed expenses	3,889	3,713
Residential lot, outparcel and multi-family unit sales, net of cost of sales	385	2,253
Other income	1,465	513
Third party management and leasing expenses	(1,998)	(1,845)
General and administrative expenses	(6,623)	(7,400)
Interest Expense	(6,268)	(7,544)
Impairment of Real Estate	(12,233)	(3,508)
Depreciation and amortization of non-real estate assets	(364)	(563)
Separation expenses	(213)	(101)
Other expenses	(698)	(862)
Loss on extinguishment of debt	(94)	0
Funds from Operations from Unconsolidated Joint Ventures	4,847	5,174
Income attributable to noncontrolling interests	(574)	(581)
Benefit (provision) for income taxes from operations	(27)	64
Preferred stock dividends	(3,227)	(3,227)
Funds from Operations Available to Common Stockholders	13,488	8,122
Real Estate Depreciation and Amortization Including Company's Share of Joint Ventures	(16,553)	(15,654)
Noncontrolling Interest Related to Gain on Sale of Depreciable Investment Property	2,043
Gain (Loss) on Sale of Depreciated Investment Properties	143	(325)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS	(13,112)	(7,857)
Office Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	16,937	15,250
Other income		371
Funds from Operations from Unconsolidated Joint Ventures	3,053	2,721
Funds from Operations Available to Common Stockholders	19,990	18,342
Retail Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	6,050	5,737
Residential lot, outparcel and multi-family unit sales, net of cost of sales		50
Other income	192	24
Funds from Operations from Unconsolidated Joint Ventures	2,152	2,241
Funds from Operations Available to Common Stockholders	8,394	8,052
Land [Member]
Segment Reporting Information [Line Items]
Residential lot, outparcel and multi-family unit sales, net of cost of sales	385	46
Funds from Operations from Unconsolidated Joint Ventures	(358)	195
Funds from Operations Available to Common Stockholders	27	241
CPS Third Party Management and Leasing [Member]
Segment Reporting Information [Line Items]
Fee income, net of reimbursed expenses	2,409	1,840
Third party management and leasing expenses	(1,998)	(1,845)
Funds from Operations Available to Common Stockholders	411	(5)
Other [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	1	1,049
Fee income, net of reimbursed expenses	1,480	1,873
Residential lot, outparcel and multi-family unit sales, net of cost of sales		2,157
Other income	1,273	118
General and administrative expenses	(6,623)	(7,400)
Interest Expense	(6,268)	(7,544)
Impairment of Real Estate		(3,508)
Depreciation and amortization of non-real estate assets	(364)	(563)
Separation expenses	(213)	(101)
Other expenses	(698)	(862)
Loss on extinguishment of debt	(94)
Funds from Operations from Unconsolidated Joint Ventures		17
Income attributable to noncontrolling interests	(574)	(581)
Benefit (provision) for income taxes from operations	(27)	64
Preferred stock dividends	(3,227)	(3,227)
Funds from Operations Available to Common Stockholders	$ (15,334)	$ (18,508)