Streets or Alleys. Where the indicated zoning boundaries are approximately street or alley lines, the center lines of the street or alley shall be construed to be the boundaries of the zone.

Lot Lines. Where the zoning boundaries are not shown to be streets or alleys, and where property has been or may hereafter be divided into blocks and lots, the zoning boundaries shall be construed to be lot lines; and where the indicated boundaries are approximately lot lines, the lot lines shall be construed to be the boundaries of the zone, unless the boundaries are otherwise determined.

Scale on Map—Determination by Commission. Where the property is indicated on a zoning map or maps as acreage and not subdivided into lots and blocks, or where the zone boundary lines are not approximately street, alley or lot lines, the zone boundary lines on the zoning map or maps shall be determined by scaled contained on the map or maps, and where uncertainty exists, the zone boundary line shall be determined by the Planning Commission. In the event property shown as acreage on the zoning map or maps has been or is subsequently subdivided into lots or blocks by a duly recorded subdivision map or record of survey and the lot and block arrangement does not conform to that anticipated when the zone boundaries were established or property is resubdivided by a duly recorded subdivision map or record of survey into a different arrangement of lots and blocks than shown on the zone map, the Planning Commission, after notice to the owners of the property affected thereby, may interpret the zone maps and make minor readjustments in the zone boundaries in such a way as to carry out the intent and purpose of these regulations and conform to the street, block and lot layout on the ground. The interpretations shall be by written decision, and thereafter the copies of the zoning maps in the Planning Commission Office shall be changed to conform thereto.

Vacated Street or Alley. In the event a dedicated street or alley shown on the zoning map or maps is vacated by resolution or ordinance, the property formerly in the street or alley shall be included within the zone of the adjoining property on either side of the vacated street or alley. In the event the street or alley was a zone boundary between two or more different zones, the new zone boundary shall be the former center line of the vacated street or alley.

Use Requirements. No building or part thereof or other structure shall be erected, altered, added to or enlarged, nor shall any land, building, structure or premises be used, designated or intended to be used for any purpose or in any manner other than is included among the uses hereinafter listed as permitted in the zone in which such buildings, land, or premises are located.

Height Requirements. No building or part thereof or structure shall be erected, reconstructed or structurally altered to exceed in height the limit hereinafter designated for the zone in which the building is located except as provided in Chapter 17.24.

Area Requirements. No building or part thereof or structure shall be erected nor shall any existing building be altered, enlarged or rebuilt or moved into any zone, nor shall any open space be encroached upon or reduced in any manner, except in conformity to the yard, building site area, and building location regulations hereinafter designated for the zone in which the building or open space is located.

Duplicate Use of Open Space and Yards. No yard or other spaces provided about any buildings for the purpose of complying with provisions of this title shall be considered a yard or open space for any other building.