Land Use & Zoning

What is an 'overlay district' in Illinois zoning?

AA zoning district that replaces the underlying zoning entirely
BA zoning regulation applied on top of existing zoning to address specific concerns (such as historic preservation or flood control) in an area✓ Correct
CA district where zoning regulations don't apply
DA buffer zone between incompatible land uses

Explanation

An overlay district is a set of zoning regulations that apply in addition to (not instead of) the underlying zoning. Overlay districts address specific geographic or policy concerns, such as historic preservation districts (requiring design review), flood overlay zones (additional flood protection standards), or transit-oriented development overlays (encouraging density near transit). Properties in an overlay must comply with both the base zone and the overlay requirements.

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