CONCENTRATIONS

Tenant Revenue Concentrations—Rental and other property income from Kaiser Foundation Health Plan, Incorporated ("Kaiser"), which occupied space in two of our Oakland, California properties, accounted for approximately 22.2% and 13.1% of our office segment revenues for the three months ended September 30, 2019 and 2018, respectively, and 15.6% and 13.0% for the nine months ended September 30, 2019 and 2018, respectively. At September 30, 2019 and December 31, 2018, $132,000 and $331,000, respectively, was due from Kaiser.

Rental and other property income from the U.S. General Services Administration and other government agencies (collectively, "Governmental Tenants"), which primarily occupied space in our properties located in Washington, D.C., accounted for approximately 11.2% and 25.3% of our office segment revenues for the three months ended September 30, 2019 and 2018, respectively, and 20.0% and 25.4% for the nine months ended September 30, 2019 and 2018, respectively. At September 30, 2019 and December 31, 2018, $768,000 and $2,899,000, respectively, was due from Governmental Tenants.

Geographical Concentrations of Investments in Real Estate—As of September 30, 2019 and December 31, 2018, we owned 8 and 16 office properties, respectively, one hotel property, one and two parking garages, respectively, and one and two development sites, respectively, one of which is being used as a parking lot. These properties are located in two states and Washington, D.C.

Our revenue concentrations from properties are as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
California	84.1	%	76.2	%	77.7	%	76.9	%
Texas	7.4		3.5		5.1		3.3
Washington, D.C.	8.5		20.3		17.2		19.8
	100.0	%	100.0	%	100.0	%	100.0	%

Our real estate investments concentrations from properties are as follows:



	September 30, 2019		December 31, 2018
California (1)	94.8	%	70.6	%
Texas	5.2		2.2
Washington, D.C.	—		27.2
	100.0	%	100.0	%


(1)	The December 31, 2018 percentage for California includes the assets of 260 Townsend Street, which was classified as held for sale on our consolidated balance sheet at December 31, 2018 and sold in March 2019 (Note 3).