Expanding eligibility to utilize the multifamily tax exemption program to all counties required or choosing to plan under RCW 36.70A.040.

SB 5679 expands eligibility for Washington's multifamily tax exemption program to include all counties required or choosing to plan under the Growth Management Act (RCW 36.70A.040), removing a previous population requirement. This change directly affects counties that must develop comprehensive plans under state law, allowing them to apply for the tax exemption program for multifamily housing projects. The bill amends definitions in RCW 84.14.010 to define "county" as any jurisdiction meeting the planning requirement, and adds new criteria for designating residential targeted areas, including mandatory displacement risk evaluations for county-designated areas after July 2021. The policy change aims to increase affordable housing opportunities by broadening access to tax incentives for qualifying multifamily developments.