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Mandatory Housing Affordability (MHA) Zones

Published by City of Seattle ArcGIS Online | City of Seattle | Catalog Last Checked: January 31, 2026 at 08:14 PM | Dataset Last Updated: January 30, 2026
Note:  This map is not an official zoning map.  For precise zoning information, please call or visit the Seattle Municipal Tower, Seattle Department of Construction and InspectionsZoning areas where Mandatory Housing Affordability requirements may apply.Mandatory Housing Affordability requires new development to contribute to affordable housing by including affordable housing in the development or making a payment to the City’s Office of Housing to support affordable housing. The amount of the MHA contribution varies based on a property’s location and other factors specified in Seattle Municipal Code Chapters 23.58B and 23.58C.  

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Complete Metadata
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accessLevel public
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description <div><span style='font-size:16px;'>Note:  This map is not an official zoning map.  For precise zoning information, please call or visit the Seattle Municipal Tower, </span><a href='https://www.seattle.gov/sdci/about-us' style='font-size:12pt;' target='_blank' rel='nofollow ugc noopener noreferrer'>Seattle Department of Construction and Inspections</a><br /></div><div><br /></div>Zoning areas where Mandatory Housing Affordability requirements may apply.<div><br /></div><div>Mandatory Housing Affordability requires new development to contribute to affordable housing by including affordable housing in the development or making a payment to the City’s Office of Housing to support affordable housing. The amount of the MHA contribution varies based on a property’s location and other factors specified in Seattle Municipal Code Chapters 23.58B and 23.58C.  </div>
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identifier https://www.arcgis.com/home/item.html?id=cce94a62698640b59031ae35292acfe5&sublayer=0
issued 2020-01-05
keyword 
                                            [
  "gis",
  "land use",
  "mha",
  "planning",
  "sdcizoningmap",
  "seattle gis open data",
  "zoning"
]
landingPage https://data-seattlecitygis.opendata.arcgis.com/datasets/SeattleCityGIS::mandatory-housing-affordability-mha-zones
license https://opendatacommons.org/licenses/pddl/summary
modified 2026-01-30
publisher 
                                            {
  "name": "City of Seattle ArcGIS Online",
  "@type": "org:Organization"
}
spatial -122.4361,47.4933,-122.2404,47.7359
theme 
                                            [
  "geospatial"
]
title Mandatory Housing Affordability (MHA) Zones

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