Which overlay district was described as unusual?

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Overlay zoning adds extra rules on top of an existing base zoning district to address specific concerns like design standards, historic preservation, or environmental limits. The central business district stands out as unusual because it is typically the defining core commercial area and is usually treated as a primary zoning category rather than an overlay. Describing the central business district as an overlay would be atypical, since overlays are usually applied to other base districts (like residential, industrial, or agricultural) to modify or add requirements. In practice, residential, industrial, and agricultural overlays are common ways to shape those areas, whereas the central business district is normally the core zoning itself, not an overlay on top of something else.