Land Use & Zoning

In Washington, an 'overlay zone' is:

AA zone that replaces the underlying zoning entirely
BA supplemental zone that adds requirements on top of the base zone for specific purposes (flood, historic, shoreline, etc.)✓ Correct
CA zoning map error corrected by the county
DA zone created for a single specific use

Explanation

An overlay zone adds additional regulatory requirements on top of the base zoning for a specific area or purpose — such as a flood hazard overlay, historic preservation overlay, or shoreline overlay — without changing the underlying zoning classification.

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