CONCENTRATIONS (Details) (USD $)									3 Months Ended			3 Months Ended													12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2014 item	Dec. 31, 2013 item	Mar. 31, 2014 Office properties item	Dec. 31, 2013 Office properties item	Mar. 31, 2014 Multi-family properties item	Dec. 31, 2013 Multi-family properties item	Mar. 31, 2014 Hotel properties item	Dec. 31, 2013 Hotel properties item	Mar. 31, 2014 Revenues Tenant Revenue Concentrations Governmental Tenants	Mar. 31, 2013 Revenues Tenant Revenue Concentrations Governmental Tenants	Dec. 31, 2013 Revenues Tenant Revenue Concentrations Governmental Tenants	Mar. 31, 2014 Revenues Geographical concentrations	Mar. 31, 2013 Revenues Geographical concentrations	Mar. 31, 2014 Revenues Geographical concentrations California	Mar. 31, 2013 Revenues Geographical concentrations California	Mar. 31, 2014 Revenues Geographical concentrations North Carolina	Mar. 31, 2013 Revenues Geographical concentrations North Carolina	Mar. 31, 2014 Revenues Geographical concentrations Texas	Mar. 31, 2013 Revenues Geographical concentrations Texas	Mar. 31, 2014 Revenues Geographical concentrations New York	Mar. 31, 2013 Revenues Geographical concentrations New York	Mar. 31, 2014 Revenues Geographical concentrations Washington, D.C.	Mar. 31, 2013 Revenues Geographical concentrations Washington, D.C.	Mar. 31, 2014 Real estate investment Geographical concentrations	Dec. 31, 2013 Real estate investment Geographical concentrations	Mar. 31, 2014 Real estate investment Geographical concentrations California	Dec. 31, 2013 Real estate investment Geographical concentrations California	Mar. 31, 2014 Real estate investment Geographical concentrations North Carolina	Dec. 31, 2013 Real estate investment Geographical concentrations North Carolina	Mar. 31, 2014 Real estate investment Geographical concentrations Texas	Dec. 31, 2013 Real estate investment Geographical concentrations Texas	Mar. 31, 2014 Real estate investment Geographical concentrations New York	Dec. 31, 2013 Real estate investment Geographical concentrations New York	Mar. 31, 2014 Real estate investment Geographical concentrations Washington, D.C.	Dec. 31, 2013 Real estate investment Geographical concentrations Washington, D.C.	Mar. 31, 2014 Loans receivable Geographical concentrations Texas	Mar. 31, 2014 Loans receivable Credit concentration
Concentrations
Concentration risk (as a percent)									26.00%	28.00%		100.00%	100.00%	60.20%	57.50%	5.30%	6.40%	7.70%	7.90%	2.10%	2.20%	24.70%	26.00%	100.00%	100.00%	50.50%	50.50%	5.60%	5.60%	7.70%	7.70%	3.70%	3.70%	32.50%	32.50%	12.00%	95.00%
Amount due from Governmental Tenants									$ 6,444,000		$ 5,596,000
Number of real estate properties owned			19	19	5	5	3	3
Number of states in which real estate properties are owned	4	4