Reportable Segments Table (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Severance Costs	$ 0	$ 0	$ 84,000	$ 0
Reimbursed Expenses	(988,000)	(1,359,000)	(1,920,000)	(3,268,000)
Dividends, Preferred Stock	(1,178,000)	(3,227,000)	(2,955,000)	(6,454,000)
Net Income (Loss) Available to Common Stockholders, Basic	(2,223,000)	(5,579,000)	2,979,000	47,593,000
Office Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	48,821,000	23,894,000	96,419,000	45,731,000
Residential lot and other sales, net of cost of sales	0	0	0	0
Fee income, Net of Reimbursed Expenses	0	0	0	0
Other Income	0	0	0	0
Severance Costs			0
General and Administrative Expense	0	0	0	0
Reimbursed Expenses	0	0	0	0
Interest Expense Including Discontinued Operations	0	0	0	0
Other nonoperating expense, including discontinued operations	0	0	0	0
Dividends, Preferred Stock	0	0	0	0
Funds from Operations Available to Common Stockholders	48,821,000	23,894,000	96,419,000	45,731,000
Retail Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	1,288,000	4,302,000	2,591,000	8,592,000
Residential lot and other sales, net of cost of sales	0	0	0	0
Fee income, Net of Reimbursed Expenses	0	0	0	0
Other Income	0	0	0	0
Severance Costs			0
General and Administrative Expense	0	0	0	0
Reimbursed Expenses	0	0	0	0
Interest Expense Including Discontinued Operations	0	0	0	0
Other nonoperating expense, including discontinued operations	0	0	0	0
Dividends, Preferred Stock	0	0	0	0
Funds from Operations Available to Common Stockholders	1,288,000	4,302,000	2,591,000	8,592,000
Land [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	0	0	0	0
Residential lot and other sales, net of cost of sales	1,331,000	276,000	1,491,000	519,000
Fee income, Net of Reimbursed Expenses	0	0	0	0
Other Income	0	0	0	0
Severance Costs			0
General and Administrative Expense	0	0	0	0
Reimbursed Expenses	0	0	0	0
Interest Expense Including Discontinued Operations	0	0	0	0
Other nonoperating expense, including discontinued operations	0	0	0	0
Dividends, Preferred Stock	0	0	0	0
Funds from Operations Available to Common Stockholders	1,331,000	276,000	1,491,000	519,000
All Other Segments [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	1,179,000	376,000	2,296,000	419,000
Residential lot and other sales, net of cost of sales	42,000	(8,000)	42,000	160,000
Fee income, Net of Reimbursed Expenses	2,025,000	2,933,000	4,363,000	6,587,000
Other Income	2,256,000	2,064,000	4,172,000	2,346,000
Severance Costs			84,000
General and Administrative Expense	(5,756,000)	(4,552,000)	(11,367,000)	(10,621,000)
Reimbursed Expenses	(988,000)	(1,359,000)	(1,920,000)	(3,269,000)
Interest Expense Including Discontinued Operations	(8,813,000)	(6,573,000)	(17,825,000)	(13,218,000)
Other nonoperating expense, including discontinued operations	(893,000)	(1,312,000)	(1,727,000)	(2,517,000)
Dividends, Preferred Stock	(4,708,000)	(5,883,000)	(6,485,000)	(9,110,000)
Funds from Operations Available to Common Stockholders	(15,656,000)	(14,314,000)	(28,535,000)	(29,223,000)
Total Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	51,288,000	28,572,000	101,306,000	54,742,000
Residential lot and other sales, net of cost of sales	1,373,000	268,000	1,533,000	679,000
Fee income, Net of Reimbursed Expenses	2,025,000	2,933,000	4,363,000	6,587,000
Other Income	2,256,000	2,064,000	4,172,000	2,346,000
Severance Costs			84,000
General and Administrative Expense	(5,756,000)	(4,552,000)	(11,367,000)	(10,621,000)
Reimbursed Expenses	(988,000)	(1,359,000)	(1,920,000)	(3,269,000)
Interest Expense Including Discontinued Operations	(8,813,000)	(6,573,000)	(17,825,000)	(13,218,000)
Other nonoperating expense, including discontinued operations	(893,000)	(1,312,000)	(1,727,000)	(2,517,000)
Dividends, Preferred Stock	(4,708,000)	(5,883,000)	(6,485,000)	(9,110,000)
Funds from Operations Available to Common Stockholders	35,784,000	14,158,000	71,966,000	25,619,000
Gain (Loss) on Sale of Depreciable Investment Properties	(38,022,000)	(19,953,000)	(74,974,000)	(35,273,000)
NET LOSS AVAILABLE TO COMMON STOCKHOLDERS	15,000	216,000	5,987,000	57,247,000
Net Income (Loss) Available to Common Stockholders, Basic	$ (2,223,000)	$ (5,579,000)	$ 2,979,000	$ 47,593,000