Mandatory Housing Affordability

Mandatory Housing Affordability (MHA) ensures that new commercial and multifamily residential development contributes to affordable housing. This is done by requiring new developments to include affordable housing (performance option) or contribute to the Seattle Office of Housing fund to support the development of affordable housing (payment option).

MHA will provide rent-restricted, income-restricted homes for low-income people. This requirement is implemented by changing zoning to allow larger development and more housing. When developers and owners apply for new building permits, the Seattle Department of Construction and Inspection reviews each proposal to determine what MHA requirements the new development is subject to. Once these requirements are confirmed, the Office of Housing will review projects to coordinate with developers to comply with the MHA Program via the payment or performance option. Answers to frequently asked questions can be found on Tip 257.