Wash. Rev. Code § 84.40.410
A leasehold interest consisting of three thousand or more residential and recreational lots that are or may be subleased for residential and recreational purposes, together with any improvements thereon, shall be assessed and taxed in the same manner as privately owned real property. The sublessee of each lot, or the lessee if not subleased, is liable for the property tax on the lot and improvements thereon. If property tax for a lot or improvements thereon remains unpaid for more than three years from the date of delinquency, including any property taxes that are delinquent as of July 22, 2001, the county treasurer may proceed to collect the tax in the same manner as for other property, except that the lessor's interest in the property shall not be extinguished as a result of any action for the collection of tax. Collection of property taxes assessed on any such lot shall be enforceable by foreclosure proceedings in accordance with real property foreclosure proceedings authorized in chapter 84.64 RCW.
RCW 84.40.410
Application-2001 c 26 ss 2 and 3: "Sections 2 and 3 of this act apply to taxes levied for collection in 2002 and thereafter." [ 2001 c 26 s 5.]