The underlying zoning of the South Main Historic District is
HCD - Historic Commercial District.
Additional zoning overlays include:
SMPD - South Main Preservation District, Map/Ordinance>>
LMPD Waterworks - Landmark Preservation District, Map/Ordinance>>
LMPD Boone's Lick, Map/Ordinance>>
EHP - Extended Historic Preservation District, Map/Ordinance>>
Primarily, these (superimposed) district designations protect historic structures, monuments, historic features, and their surroundings from non-compatible land uses. In addition, they provide some measure of protection for these areas through an application and review process to ensure construction, alterations, and additions complement the established character.
(Missouri Riverfront Concept Plan, p49)