CONCENTRATIONS

Tenant Revenue Concentrations—Rental revenue, excluding tenant reimbursements of certain costs, from the U.S. General Services Administration and other government agencies (collectively, "Governmental Tenants"), which primarily occupied properties located in Washington, D.C., accounted for approximately 19.7%, 21.2% and 19.8% of our rental and other property income and hotel income for the years ended December 31, 2018, 2017 and 2016, respectively. At December 31, 2018 and 2017, $2,899,000 and $5,130,000, respectively, was due from Governmental Tenants (Note 17).

Rental revenue, excluding tenant reimbursements of certain costs, from Kaiser Foundation Health Plan, Incorporated ("Kaiser"), which occupied space in two of our Oakland, California properties, accounted for approximately 10.2%, 8.7% and 7.1% of our rental and other property income and hotel income for the years ended December 31, 2018, 2017 and 2016, respectively. At December 31, 2018 and 2017, $331,000 and $91,000, respectively, was due from Kaiser.

Geographical Concentrations of Investments in Real Estate—As of December 31, 2018, 2017 and 2016, we owned 16, 15 and 20 office properties, respectively; zero, zero and five multifamily properties, respectively; one hotel property; two, two and three parking garages, respectively; and two development sites, one of which is being used as a parking lot. As of December 31, 2018, 2017 and 2016, these properties were located in two, two and four states, respectively, and Washington, D.C.

Our revenue concentrations from properties are as follows:



	Year Ended December 31,
	2018		2017		2016
California	76.1	%	63.2	%	63.4	%
Washington, D.C.	20.6		25.1		21.3
Texas	3.3		6.9		8.2
North Carolina	—		3.1		5.2
New York	—		1.7		1.9
	100.0	%	100.0	%	100.0	%

Our real estate investments concentrations from properties are as follows:



	December 31,
	2018		2017
California (1)	70.6	%	66.4	%
Washington, D.C.	27.2		31.2
Texas	2.2		2.4
	100.0	%	100.0	%


(1)	Includes the assets of 260 Townsend Street, which is classified as held for sale on our consolidated balance sheet at December 31, 2018 (Note 3).