CONCENTRATIONS

Tenant Revenue Concentrations—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 21.9% and 24.7% of our office segment revenues for the three months ended June 30, 2019 and 2018, respectively, and 22.7% and 25.4% for the six months ended June 30, 2019 and 2018, respectively. At June 30, 2019 and December 31, 2018, $1,528,000 and $2,899,000, respectively, was due from Governmental Tenants.

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 16.9% and 12.2% of our office segment revenues for the three months ended June 30, 2019 and 2018, respectively, and 13.5% and 12.9% for the six months ended June 30, 2019 and 2018, respectively. At June 30, 2019 and December 31, 2018, $131,000 and $331,000, respectively, was due from Kaiser.

Geographical Concentrations of Investments in Real Estate—As of June 30, 2019 and December 31, 2018, we owned 10 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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
California	74.4	%	77.7	%	75.6	%	77.3	%
Washington, D.C.	20.4		19.1		20.1		19.5
Texas	5.2		3.2		4.3		3.2
	100.0	%	100.0	%	100.0	%	100.0	%

Our real estate investments concentrations from properties are as follows:



	June 30, 2019		December 31, 2018
California (1)	72.7	%	70.6	%
Washington, D.C. (1)	23.6		27.2
Texas	3.7		2.2
	100.0	%	100.0	%

(1)

The June 30, 2019 percentage for Washington, D.C. includes the assets of 899, 999 and 901 N Capitol Street, which are classified as held for sale on our consolidated balance sheet at June 30, 2019 (Note 3). 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 (Note 3).