From the ordinance
All territory which may hereafter be incorporated into the city by boundary adjustment, annexation, or otherwise shall be construed as being temporarily classified in the city zoning district or districts which each parcel of property in such territory adjoins or abuts in the city at the time of its incorporation into the city. Should any parcel of property in said territory not adjoin or abut an existing city zoning district, it shall temporarily be classified as being within the residential 'A' zoning district.