CONCENTRATIONS (Details) (USD $)									3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2014 item	Dec. 31, 2013 item	Sep. 30, 2014 Office properties item	Dec. 31, 2013 Office properties item	Sep. 30, 2014 Multi-family properties item	Dec. 31, 2013 Multi-family properties item	Sep. 30, 2014 Hotel properties item	Dec. 31, 2013 Hotel properties item	Sep. 30, 2014 Revenues Tenant Revenue Concentrations Governmental Tenants	Sep. 30, 2013 Revenues Tenant Revenue Concentrations Governmental Tenants	Sep. 30, 2014 Revenues Tenant Revenue Concentrations Governmental Tenants	Sep. 30, 2013 Revenues Tenant Revenue Concentrations Governmental Tenants	Dec. 31, 2013 Revenues Tenant Revenue Concentrations Governmental Tenants	Sep. 30, 2014 Revenues Geographical concentrations	Sep. 30, 2013 Revenues Geographical concentrations	Sep. 30, 2014 Revenues Geographical concentrations	Sep. 30, 2013 Revenues Geographical concentrations	Sep. 30, 2014 Revenues Geographical concentrations California	Sep. 30, 2013 Revenues Geographical concentrations California	Sep. 30, 2014 Revenues Geographical concentrations California	Sep. 30, 2013 Revenues Geographical concentrations California	Sep. 30, 2014 Revenues Geographical concentrations North Carolina	Sep. 30, 2013 Revenues Geographical concentrations North Carolina	Sep. 30, 2014 Revenues Geographical concentrations North Carolina	Sep. 30, 2013 Revenues Geographical concentrations North Carolina	Sep. 30, 2014 Revenues Geographical concentrations Texas	Sep. 30, 2013 Revenues Geographical concentrations Texas	Sep. 30, 2014 Revenues Geographical concentrations Texas	Sep. 30, 2013 Revenues Geographical concentrations Texas	Sep. 30, 2014 Revenues Geographical concentrations New York	Sep. 30, 2013 Revenues Geographical concentrations New York	Sep. 30, 2014 Revenues Geographical concentrations New York	Sep. 30, 2013 Revenues Geographical concentrations New York	Sep. 30, 2014 Revenues Geographical concentrations Washington, D.C.	Sep. 30, 2013 Revenues Geographical concentrations Washington, D.C.	Sep. 30, 2014 Revenues Geographical concentrations Washington, D.C.	Sep. 30, 2013 Revenues Geographical concentrations Washington, D.C.	Sep. 30, 2014 Real estate investments Geographical concentrations	Dec. 31, 2013 Real estate investments Geographical concentrations	Sep. 30, 2014 Real estate investments Geographical concentrations California	Dec. 31, 2013 Real estate investments Geographical concentrations California	Sep. 30, 2014 Real estate investments Geographical concentrations North Carolina	Dec. 31, 2013 Real estate investments Geographical concentrations North Carolina	Sep. 30, 2014 Real estate investments Geographical concentrations Texas	Dec. 31, 2013 Real estate investments Geographical concentrations Texas	Sep. 30, 2014 Real estate investments Geographical concentrations New York	Dec. 31, 2013 Real estate investments Geographical concentrations New York	Sep. 30, 2014 Real estate investments Geographical concentrations Washington, D.C.	Dec. 31, 2013 Real estate investments Geographical concentrations Washington, D.C.	Sep. 30, 2014 Loans receivable Geographical concentrations Texas	Sep. 30, 2014 Loans receivable Geographical concentrations Virginia	Sep. 30, 2014 Loans receivable Credit concentration
Concentrations
Concentration risk (as a percent)									24.40%	29.10%	24.90%	28.00%		100.00%	100.00%	100.00%	100.00%	60.30%	56.80%	60.30%	57.20%	4.60%	6.10%	5.30%	6.40%	8.00%	8.50%	7.80%	8.20%	2.20%	2.20%	2.10%	2.20%	24.90%	26.40%	24.50%	26.00%	100.00%	100.00%	51.70%	50.50%	5.50%	5.60%	7.50%	7.70%	3.60%	3.70%	31.70%	32.50%	11.70%	10.50%	94.30%
Amount due from Governmental Tenants									$ 6,991,000		$ 6,991,000		$ 5,596,000
Number of real estate properties owned			20	19	5	5	3	3
Number of states in which real estate properties are owned	4	4