CONCENTRATIONS

Tenant Revenue Concentrations—Rental revenue from the U.S. General Services Administration and other government agencies (collectively, "Governmental Tenants"), which primarily occupy space in our properties located in Washington, D.C., accounted for approximately 23.0% and 25.1% of our rental and other property income for the three months ended March 31, 2019 and 2018, respectively. At March 31, 2019 and December 31, 2018, $1,928,000 and $2,899,000, respectively, was due from Governmental Tenants.

Rental revenue from Kaiser Foundation Health Plan, Incorporated ("Kaiser"), which occupied space in two of our Oakland, California properties, accounted for approximately 12.9% and 13.1% of our rental and other property income for the three months ended March 31, 2019 and 2018, respectively. At March 31, 2019 and December 31, 2018, $1,000 and $331,000, respectively, was due from Kaiser.

Geographical Concentrations of Investments in Real Estate—As of March 31, 2019 and December 31, 2018, we owned 11 and 16 office properties, respectively, one hotel property, one and two parking garages, respectively, and two development sites, 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 March 31,
	2019		2018
California	76.5	%	76.8	%
Washington, D.C.	19.9		19.9
Texas	3.6		3.3
	100.0	%	100.0	%

Our real estate investments concentrations from properties are as follows:



	March 31, 2019		December 31, 2018
California (1)	74.3	%	70.6	%
Washington, D.C.	22.4		27.2
Texas	3.3		2.2
	100.0	%	100.0	%


(1)	The March 31, 2019 percentage includes the assets of 1333 Broadway, which is classified as held for sale on our consolidated balance sheet at March 31, 2019 (Note 3). The December 31, 2018 percentage includes the assets of 260 Townsend Street, which was classified as held for sale on our consolidated balance sheet at December 31, 2018 (Note 3).