Historic District designation is a “Zoning Overlay” administered by the City of San Antonio. Two additional zoning overlay districts within the boundaries of the King William Association include NCD-1 and RIO-4. Both NCD-1 and RIO-4 are Zoning Overlays. Each property within the boundaries of these districts has its own base zoning which determines the use of the property. For example, a building could be C-1 for commercial use, such as a retail store or a restaurant, or O-1 for an office use. The overlay zoning districts regulate the property’s architectural and site characteristics.

NCD-1 is Neighborhood Conservation District #1. The first conservation district created was the South Presa/South Saint Mary’s Streets Commercial Corridor. According to the City’s UDC (Unified Development Code) the purpose of an NCD is “to protect and strengthen unique physical features and design characteristics to promote economic revitalization while protecting and enhancing harmonious redevelopment.” NCD-1 is administered by the City’s Planning Department.

RIO-4 is River Improvement Overlay area 4. According to the City’s website: “The design objectives for RIO-4 are: to encourage urban quality mixed-use developments; to preserve and enhance the historic character as well as emphasize the street scene; to construct new development that complements the nearby historic King William area but does not mimic its style; and to encourage new development in clustered nodes.” RIO-4 is administered by the City’s Office of Historic Preservation.

- Cherise Bell