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 17.3%, 12.9% and 10.8% of our office segment revenues for the years ended December 31, 2019, 2018 and 2017, respectively. At December 31, 2019 and 2018, $23,000 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 17.1%, 24.6% and 29.4% of our office segment revenues for the years ended December 31, 2019, 2018 and 2017, respectively. At December 31, 2019 and 2018, $282,000 and $2,899,000, respectively, was due from Governmental Tenants.

Geographical Concentrations of Investments in Real Estate—As of December 31, 2019, 2018 and 2017, we owned 8, 16 and 15 office properties, respectively; one hotel property; one, two and two parking garages, respectively; and one, two, and two development sites, respectively, one of which is being used as a parking lot. As of December 31, 2019, 2018 and 2017, these properties were located in two states, and in Washington, D.C. as of December 31, 2018 and 2017.

Our revenue concentrations from properties are as follows:



	Year Ended December 31,
	2019		2018		2017
California	80.6	%	76.0	%	63.3	%
Texas	5.5		3.3		6.9
Washington, D.C.	13.9		20.7		25.1
North Carolina	—		—		3.1
New York	—		—		1.6
	100.0	%	100.0	%	100.0	%

Our real estate investments concentrations from properties are as follows:



	December 31,
	2019		2018
California (1)	94.4	%	70.6	%
Texas	5.6		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).