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 23.1% and 24.4% of our rental and other property income for the three months ended September 30, 2015 and 2014, respectively, and 22.9% and 24.9% for the nine months ended September 30, 2015 and 2014, respectively. At September 30, 2015 and December 31, 2014, $6,468,000 and $7,168,000, respectively, was due from Governmental Tenants (see Note 16).

Geographical Concentrations of Investments in Real Estate—As of September 30, 2015, we owned 21 office properties, five multifamily properties, three hotel properties, three parking garages, and two development sites, one of which is being used as a parking lot, located in four states and Washington, D.C. As of December 31, 2014, we owned the same real estate investments with the exception of the parking lot, which was purchased in August 2015 (see Note 4).

Our revenue concentrations from properties are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
California		62.4	%		60.3	%		62.6	%		60.3	%
Washington, D.C.		24.0			24.9			24.1			24.5
Texas		8.0			8.0			7.8			7.8
North Carolina		4.6			4.6			4.6			5.3
New York		1.0			2.2			0.9			2.1

		100.0	%		100.0	%		100.0	%		100.0	%

Our real estate investment concentrations from properties are as follows:

	September 30, 2015			December 31, 2014
California		52.8	%		52.3	%
Washington, D.C.		30.9			31.2
Texas		7.4			7.4
North Carolina		5.3			5.5
New York		3.6			3.6

		100.0	%		100.0	%