Reportable Segments Table (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Severance Costs	$ (102,000)	$ (84,000)
Reimbursed Expenses	(1,111,000)	(932,000)
Dividends, Preferred Stock	0	(1,777,000)
Net income available to common stockholders	7,203,000	5,200,000
Office Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	56,734,000	47,598,000
Residential lot and other sales, net of cost of sales	0	0
Fee income, Net of Reimbursed Expenses	0	0
Other Income	0	0
Gain on Sale of Third Party Management Operations		0
Severance Costs	0	0
General and Administrative Expense	0	0
Reimbursed Expenses	0	0
Interest Expense Including Discontinued Operations	0	0
Other nonoperating expense, including discontinued operations	0	0
Dividends, Preferred Stock		0
Funds from Operations Available to Common Stockholders	56,734,000	47,598,000
Retail Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	0	1,303,000
Residential lot and other sales, net of cost of sales		0	0
Fee income, Net of Reimbursed Expenses		0	0
Other Income		0	0
Gain on Sale of Third Party Management Operations		0
Severance Costs		0	0
General and Administrative Expense		0	0
Reimbursed Expenses		0	0
Interest Expense Including Discontinued Operations		0	0
Other nonoperating expense, including discontinued operations		0	0
Dividends, Preferred Stock		0
Funds from Operations Available to Common Stockholders	0	1,303,000
Land [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	0	0
Residential lot and other sales, net of cost of sales	810,000	160,000
Fee income, Net of Reimbursed Expenses		0	0
Other Income		0	0
Gain on Sale of Third Party Management Operations		0
Severance Costs		0	0
General and Administrative Expense		0	0
Reimbursed Expenses		0	0
Interest Expense Including Discontinued Operations		0	0
Other nonoperating expense, including discontinued operations		0	0
Dividends, Preferred Stock		0
Funds from Operations Available to Common Stockholders	810,000	160,000
All Other Segments [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	1,319,000	1,117,000
Residential lot and other sales, net of cost of sales	0	0
Fee income, Net of Reimbursed Expenses	1,816,000	2,339,000
Other Income	407,000	1,908,000
Gain on Sale of Third Party Management Operations		7,000
Severance Costs	(102,000)	(84,000)
General and Administrative Expense	(3,493,000)	(5,611,000)
Reimbursed Expenses	(1,111,000)	(932,000)
Interest Expense Including Discontinued Operations	(9,498,000)	(9,012,000)
Other nonoperating expense, including discontinued operations	(947,000)	(834,000)
Dividends, Preferred Stock		(1,777,000)
Funds from Operations Available to Common Stockholders	(11,609,000)	(12,879,000)
Total Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	58,053,000	50,018,000
Residential lot and other sales, net of cost of sales	810,000	160,000
Fee income, Net of Reimbursed Expenses	1,816,000	2,339,000
Other Income	407,000	1,908,000
Gain on Sale of Third Party Management Operations		7,000
Severance Costs	(102,000)	(84,000)
General and Administrative Expense	(3,493,000)	(5,611,000)
Reimbursed Expenses	(1,111,000)	(932,000)
Interest Expense Including Discontinued Operations	(9,498,000)	(9,012,000)
Other nonoperating expense, including discontinued operations	(947,000)	(834,000)
Dividends, Preferred Stock		(1,777,000)
Funds from Operations Available to Common Stockholders	45,935,000	36,182,000
Real estate depreciation and amortization, including Company's share of joint ventures	(38,997,000)	(36,953,000)
Gain on sale of depreciated investment properties, including Company's share of joint ventures	265,000	5,971,000
Net income available to common stockholders	$ 7,203,000	$ 5,200,000