17. CONCENTRATIONS

Tenant Revenue Concentrations—Rental revenues from the U.S. General Services Administration and other government agencies (collectively, “Governmental Tenants”), which primarily occupy properties located in Washington, D.C., accounted for approximately 22.7%, 24.7% and 27.5% of our rental and other property income for the years ended December 31, 2015, 2014 and 2013, respectively. At December 31, 2015 and 2014, $7,968,000 and $7,168,000, respectively, was due from Governmental Tenants (see Note 16).

Geographical Concentrations of Investments in Real Estate—As of December 31, 2015, 2014 and 2013, we owned 20, 21 and 19 office properties, respectively, five multifamily properties, three hotel properties, three parking garages, and one development site. In addition, as of December 31, 2015, we owned one development site which was purchased in August 2015 and is being used as a parking lot (see Note 4). These properties are located in four states and Washington, D.C.

Our revenue concentrations from properties are as follows:


	Year Ended December 31,
	2015		2014		2013
California	62.2	%	60.4	%	57.1	%
Washington, D.C.	24.2		24.7		26.5
Texas	7.8		7.7		8.1
North Carolina	4.6		5.1		6.1
New York	1.2		2.1		2.2
	100.0	%	100.0	%	100.0	%

Our real estate investments concentrations from properties are as follows:


	December 31,
	2015		2014
California	52.6	%	52.3	%
Washington, D.C.	31.1		31.2
Texas	7.4		7.4
North Carolina	5.3		5.5
New York	3.6		3.6
	100.0	%	100.0	%