Comprehensive Plan GMA Compliance

Landlords operating within the Town Center and Multifamily zones have to meet additional operating requirements (TC and MF zones). Mercer Island Zoning Map Source: Mercer Island GIS Hub
https://city-of-mercer-island-gis-hub-mercerislandgis.hub.arcgis.com/ Accessed June 10, 2026.The requirements are limited to these zones to specifically address the displacement risk identified in the Displacement Risk Evaluation. The new operating requirements implement two substantial requirements; Advance Notice of Rent Increase and Relocation Assistance.

Advance Notice of Rent Increase: the operating requirements would require landlords for properties located in the Town Center and Multifamily zones to provide the following notice when increasing rent:

• If the rent increase exceeds a cumulative three percent (3%) within a twelve- (12) month period, the landlord must notify all tenants or subtenants of market rate or income-restricted housing units at least one hundred twenty (120) days prior to the increase taking effect.
• If the rent increase is three percent (3%) or under for market rate units, the state law requires a 90-day notice (RCW 59.18.140).
• If the rent increase for income-restricted units is three percent (3%) or under, the landlord must notify the tenants at least 30-days' prior. Tenants in income-restricted units would be allowed to terminate the tenancy immediately upon surrendering the dwelling unit prior to the increase taking effect. The landlord must inform the tenant of this option in the notice of rent increase.

Relocation Assistance: the operating requirements also require landlords for properties located in the Town Center and Multifamily zones to follow the provisions below for relocation assistance:

• Relocation assistance must be provided to each low-income household (<80% AMI) in the event of rental property demolition, substantial rehabilitation, change of use, and/or removal of rent or income restriction (together, “Relocation Event”).

The average Mercer Island household would be considered low income if income is under approximately $100,000 annually. Source: King County Housing Authority https://www.kcha.org/housing/subsidized/eligibility Accessed: June 2, 2026

• For each relocation event, relocation assistance must equal two thousand dollars ($2,000), as provided in RCW 59.18.440(4)(a).
• The payment shall be in addition to the refund of the security deposit or other sums which the tenant is lawfully qualified to receive.
• The landlord must provide each tenant eligible for relocation assistance a written notice at least 90 days prior to a relocation event (“Relocation Notice”). In addition, a copy of the relocation notice would be posted at every entrance to any building containing dwelling units where a relocation event will occur.
• The tenant must provide written intent to vacate the rental property to the landlord.
• The landlord must provide the full relocation assistance amount to each eligible household at least 45 days prior to the relocation event.
• The landlord is then able to apply for reimbursement for half the relocation assistance amount from the City.

The Ordinance No. 26C-27 allows a tenant or landlord to resolve relocation assistance disputes through a Hearing Examiner public hearing. The landlord or tenant will file a written request for a hearing and clearly state specific objection(s) and the relief sought with the City Clerk. There is no filing fee for a hearing request. The Hearing Examiner shall issue a decision within 30 days of the filing of the request for a hearing.

If a landlord is found to be in violation or noncompliance of the chapter, including the operating requirements, they may be found guilty of a misdemeanor and shall be subject to a $500 fine and/or imprisonment for a period not exceeding 90 days or both such fine and imprisonment. Each day that an offense is committed or permitted to continue shall be considered a separate offense.

On June 10, the Planning Commission will continue the public hearing on the Comprehensive Plan Update, Station Subarea Plan, and Development Code Amendments. The City has published one planning commission bill for consideration:

• Planning Commission Bill 26-08: Public Hearing (Continued): Comprehensive Plan Update, Station Subarea Plan, and Implementing Development Code Amendments
  • Planning Commission Bill Exhibit 1: Amended Comprehensive Plan
    • Appendix I: Land Capacity Analysis (p. 159)
    • Appendix J: Barriers Analysis (p. 214)
  • Planning Commission Bill Exhibit 2: Station Subarea Plan
  • Planning Commission Bill Exhibit 3: Implementing Development Code Amendments
  • Planning Commission Bill Exhibit 4: Written Public Comment Index

The Planning Commission public meetings will be held at 6:00pm, in the Slater Room at the Mercer Island Community and Event Center, located at 8236 SE 24th Street, Mercer Island. Information to attend virtually can be found on the June 10, 2026, Planning Commission meeting(External link) webpage.

The Mercer Island Planning Commission will hold a public hearing on Wednesday, June 3, 2026, at 6 p.m. at the Mercer Island Community and Events Center regarding proposed updates to the Comprehensive Plan and Development Code as well as a proposed Station Subarea Plan. These revisions address a Growth Management Hearings Board order to expand affordable housing capacity, implement a new Station Subarea Plan, and adopt anti-displacement measures.

Project documents available for public review and comment include:

Meeting Agenda and Packet

Technical Documents

• Land Capacity Analysis
• Barriers Analysis
• Displacement Risk Evaluation
• Affordable Housing Nexus Study

Proposed Amendments

• Comprehensive Plan (updated 5-28-2026, updated 6-1-2026 to add map on page 121)
• Station Subarea Plan (updated 5-28-2026)
• Title 19 Development Code Amendments (updated 5-28-2026)

The public hearing is the primary opportunity for the community to provide feedback to the Planning Commission and City Council on these matters. Residents may participate in the public hearing in person or via Zoom. Written comments are accepted via email to planning.commission@mercerisland.gov until the hearing adjourns. Detailed instructions on how to comment live during the public hearing will be available online on or before May 29, 2026, at https://www.mercerisland.gov/bc-pc. Submitting written comments and/or participating in this hearing is required to establish standing for any future appeals.

The Planning Commission will finalize its recommendation on updating the Comprehensive Plan and Development code as well as the proposed Station Subarea Plan on June 10 and present those recommendations to the City Council on June 16. The City Council will consider the recommended amendments in July.

On June 2, the City Council will receive the next briefing on the Growth Management Hearings Board (GMHB) Order. Staff will be briefing City Council on Ordinance 26C-07 to implement anti-displacement policies for GMA Compliance. The City has published one agenda bills for consideration:

• Agenda Bill 6938: Public Hearing of MICC Title 5 Amendments Anti-Displacement Measures (First Reading, Ord. No. 26C-07)
  • Exhibit 1: Ordinance No. 26C-07
  • Exhibit 2: Displacement Risk Evaluation

Please see the City of Mercer Island June 2, 2026, meeting webpage for information on how to attend in person or virtually, and how to register to make a public comment.

On May 27, the Planning Commission will receive briefing on the Comprehensive Plan Transportation, Utilities and Capital Facilities Elements.

The City has published one planning commission bill for consideration:

• Planning Commission Bill 26-06: Briefing on Comprehensive Plan Elements
  • Planning Commission Bill Exhibit 1: Draft Transportation Element
  • Planning Commission Bill Exhibit 2: Draft Utilities Element
  • Planning Commission Bill Exhibit 3: Draft Capital Facilities Element

The Planning Commission public meetings will be held at 6:00pm, in the Slater Room at the Mercer Island Community and Event Center, located at 8236 SE 24th Street, Mercer Island. Information to attend virtually can be found on the May 27, 2026, Planning Commission meeting(External link) webpage.

On May 13, the Planning Commission will receive briefing on Development Code Amendments for Comprehensive Plan GMA Compliance.

The City has published one planning commission bill for consideration:

• Planning Commission Bill 26-05: Briefing on Development Code Amendments: land capacity: zoning map, Town Center boundary and subareas, height increases, permitted uses, design standards, consistency.
  • Planning Commission Bill 26-05 Exhibit 1: Development Code Amendments

The Planning Commission public meetings will be held at 6:00pm, in the Slater Room at the Mercer Island Community and Event Center, located at 8236 SE 24th Street, Mercer Island. Information to attend virtually can be found on the May 13, 2026, Planning Commission meeting webpage.

On May 6, the Planning Commission will receive briefing on the Comprehensive Plan Elements and Station Subarea Plan.

The City has published one planning commission bill for consideration:

• Planning Commission Bill 26-04: Briefing on Comprehensive Plan Elements and Station Subarea Plan
  • Planning Commission Bill Exhibit 1: Initial Draft Station Subarea Plan
  • Planning Commission Bill Exhibit 2: Draft Land Use, Housing, and Economic Development Elements

The Planning Commission public meetings will be held at 6:00pm, in the Slater Room at the Mercer Island Community and Event Center, located at 8236 SE 24th Street, Mercer Island. Information to attend virtually can be found on the May 6, 2026, Planning Commission meeting webpage.

The Washington State Growth Management Act (GMA) requires local governments to include a housing element in their comprehensive plan that identifies sufficient land capacity and zoning to accommodate housing for all income segments. Affordable Housing is defined in the GMA as housing that is affordable to those earning at or below 80% of the Area Median Income (AMI). STEP is an acronym for several types of housing, including: shelters, transitional housing, emergency housing, and permanent supportive housing. This article will provide more information on these housing types and the requirements in State law for cities pertaining to providing for this housing.

What is AMI?

Affordable housing is often characterized based on percentages of the Area Median Income, or AMI. AMI is the midpoint of a specific area’s income distribution and is calculated by the U.S. Department of Housing and Urban Development (HUD) each year. The HUD calculation determines median income for a four-person household based on the Census Bureau’s American Community Survey (ACS) data and is adjusted for inflation based on projected per capita wage growth. The geographic area is determined by HUD’s Metro FMR Area definitions.

Mercer Island is part of the Seattle-Bellevue, WA Metro FMR Area, which contains King and Snohomish Counties. The 2025 AMI for the Seattle-Bellevue FMR Area is $157,100. AMI can be adjusted based on household size and income level. Below is a table from A Regional Coalition for Housing (ARCH) with 2025 AMI levels based on household size.

Mercer Island’s Housing Needs

Under the GMA, cities are required to plan for housing needs across income levels. Cities must provide capacity for the identified housing units at each affordability level AND provide "adequate provisions," such as regulations and incentives, to help make this housing available. Housing needs, also referred to as "affordable housing targets," were identified statewide by the Department of Commerce, broken out by county. Counties then allocated housing needs to cities. Mercer Island’s housing needs, as assigned by King County, are shown below. Mercer Island has a total housing target of 1,239 units, of which 1,211 units are affordable housing units. In addition, 237 Emergency Housing beds are needed.

Extremely Low-Income Housing (0-30% AMI)

Mercer Island’s affordable housing targets include 517 units of “extremely low-income” or 0-30% AMI housing units. As shown in the chart above, this housing is for individuals earning less than $32,991 or a family of four earning less than $47,130. These 517 units are further categorized as Permanent Supportive Housing or Other Extremely Low-Income Housing.

Permanent Supportive Housing

178 of the 517 extremely low-income units must be designated as Permanent Supportive Housing or PSH. PSH is defined in the GMA as leased, long-term housing that includes support services (on- or off-site) and is designed to support persons with complex behavioral or physical health conditions and who are experiencing or at imminent risk of homelessness. This housing is intended to be “low barrier,” meaning it utilizes admissions practices that are less rigorous than typical for other subsidized or unsubsidized rental housing, especially related to “rental history, criminal history, and personal behaviors.” RCW 36.70A.030(33). The City must allow this housing in zones that permit residential uses and/or hotels. RCW 35A.21.430.

Other Extremely Low-Income Housing

The remaining 339 extremely low-income units constitute leased, long-term housing for individuals or families that meet the extremely low-income limits (30% AMI or below). This housing does not include support services. Eligibility for this housing can include seniors or people with disabilities on a fixed income as well as people who simply earn a low income. For example, a single parent with one child at home, working full time and earning minimum wage, would fall into this income level.

Other Affordable Housing

Mercer Island’s remaining affordable housing targets correspond to the Very Low-Income (30-50% AMI), Low-Income (50-80% AMI) and Moderate-Income (80-100% AMI) affordability levels. In total, the City must plan to accommodate 694 units across these affordability levels. The City’s consultant, Community Attributes, drafted the 2026 Land Capacity Analysis (LCA) showing that these housing needs can be addressed by unsubsidized, market-rate development when additional development capacity is added to the City.

The City Council has directed a phased approach to adding development capacity, with the Phase 1 upzones focused in and around the Town Center. The LCA shows that the planned upzones are sufficient to provide adequate capacity for the required affordable housing units between 30%-100% AMI.

Emergency Housing and Emergency Shelters

Emergency housing is temporary indoor accommodations for individuals or families who are homeless or at imminent risk of becoming homeless, and it may or may not require a lease or occupancy agreement. RCW 36.70A.030(15). Emergency shelters provide temporary shelter for individuals or families who are currently homeless, may not require a lease or occupancy agreement, and include day and warming centers that do not provide overnight accommodations. RCW 36.70A.030(16).

The City must allow these housing types in zones that allow hotels. RCW 35A.21.430. In addition, the City must provide adequate land capacity to accommodate the 237-bed target for emergency housing and shelters. RCW 36.70A.115.

Emergency housing and emergency shelters are currently regulated through interim regulations (Ordinance No. 26-02). These regulations will need to be replaced with permanent regulations to maintain compliance with state law. The Growth Management Hearings’ Board (“Board”) found the City’s emergency housing regulations in compliance with the GMA. However, recent legislation requires the City to amend these provisions related to spacing and operational requirements. This will be addressed as a part of the effort to comply with the Board's order.

Regulating Affordable, Permanent Supportive and Emergency Housing

Affordable Housing

PSH and other affordable housing are afforded the protections provided in Chapter 36.130. RCW, Affordable Housing Development, which applies to housing that is affordable up to 80% AMI. This means that development regulations applicable to PSH and other affordable housing are regulated by Chapter 36.130 RCW, and cities may not impose requirements that are different than the requirements imposed on housing generally.

Some exceptions to this apply such that conditions may be imposed on affordable housing developments, including PSH, as a prerequisite to receiving optional assistance such as tax benefits, subsidy funds, sale or lease of public property, or eligibility for optional housing incentive programs such as density bonuses, height and bulk bonuses, fee waiver, parking reduction, or expedited permitting. RCW 36.130.020(3), RCW 36.70A.540. If a developer, however, chooses not to participate in an optional program, a city may not condition approval of a permit that is otherwise consistent with development standards. RCW 36.70A.540(1)(c).

Emergency housing and shelters are not “affordable housing,” and are not subject to the protections of Chapter 36.130 RCW. However, recently adopted legislation, HB 2266, limits the regulatory requirements that local jurisdictions may enact. As mentioned above, this housing must be permitted in zones that allow hotels. Additionally, jurisdictions may not require any standards, conditions, or requirements for this housing that are more restrictive than those required for other types of lodging or residential development in the zone.

Occupancy Standards

Occupancy standards regulate who is permitted to live in a specific type of housing. All of the housing types discussed in this memo are subject to Federal and State fair housing and anti-discrimination laws. These laws protect certain groups, generally prohibit discrimination, and apply to the regulation of occupancy. In addition, as outlined above, State law provides that affordable housing must be regulated the same as housing developments generally. RCW 36.130.020. Thus, the City has very little authority to regulate occupancy of PSH or other types of affordable housing.

Additional Resources

Department of Commerce Guidance

• Updating Housing Elements
• STEP Housing
• STEP Housing Definitions

Relevant Legislation

• HB 1220
• HB 2266

On April 29, the Planning Commission will begin review of amendments to the Comprehensive Plan and development regulations as well as a proposed Station Subarea Plan related to GMA Compliance Project. At this meeting, Staff will be briefing the Planning Commission on the Station Subarea Plan Goals and Policies and the schedule for the legislative review of necessary amendments to the Comprehensive Plan and Development Regulations. The City has published two planning commission bills for consideration:

• Planning Commission Bill 26-02: Planning Commission Legislative Review Process
  • Exhibit 1: Planning Commission Legislative Review Schedule
• Planning Commission Bill 26-03: Briefing on Station Subarea Plan Goals and Policies
  • Exhibit 1: Station Subarea Plan

The Planning Commission legislative review schedule is as follows:

April 29: Station Subarea Plan

May 6: Comprehensive Plan Amendments

May 13: Development Code Amendments

May 20: Development Code Amendments

May 27: Comprehensive Plan Amendments

June 3: Public Hearing

June 10: Planning Commission Recommendation

June 16: Presentation of Planning Commission Recommendations to City Council

The Planning Commission public meetings will be held at 6:00pm, in the Slater Room at the Mercer Island Community and Event Center, located at 8236 SE 24th Street, Mercer Island. Information to attend virtually can be found using the "Meeting Details" links on the Planning Commission Meetings page.

At its regular meeting on April 21, 2026, the City Council provided final direction on the strategy to achieve GMA Compliance. City Council gave the following direction:

1. Set the inclusionary zoning requirements at 10% of units to be affordable at 50% AMI when drafting code amendments to comply with the GMHB Order.
2. Prohibit adult entertainment and warehousing in the TC-8 subarea when drafting code amendments to comply with the GMHB Order.
3. Include policy direction in the Station Subarea Plan to review the requirements for average daylight plane, major site features, and major façade modulation during Station Subarea Plan Phase 2.

The City Council also directed the Planning Commission to initiate legislative review of the required amendments to the Comprehensive Plan and Development Code, alongside a proposed Station Subarea Plan. The Planning Commission review process begins on April 29 and is scheduled to conclude by June 10 with a formal recommendation to the City Council. The Commission will also hold a public hearing on the proposed amendments on June 3. Following this, the City Council will review the Commission’s recommendations and adopt the necessary ordinances during its meetings throughout June and July. This timeline ensures the City meets the mandatory Growth Management Hearings Board compliance deadline of July 31, 2026.

The Planning Commission legislative review schedule is as follows:

April 29: Station Subarea Plan

May 6: Comprehensive Plan Amendments

May 13: Development Code Amendments

May 20: Development Code Amendments

May 27: Comprehensive Plan Amendments

June 3: Public Hearing

June 10: Planning Commission Recommendation

June 16: Presentation of Planning Commission Recommendations to City Council

The Planning Commission public meetings will be held at 6:00pm, in the Slater Room at the Mercer Island Community and Event Center, located at 8236 SE 24th Street, Mercer Island. Information to attend virtually can be found using the "Meeting Details" links on the Planning Commission Meetings page.