Boundaries of the districts as enumerated in section 3 of this ordinance are hereby established and adopted on the zoning maps of the City of Katy which are made a part of this ordinance as fully as if the same were set forth herein in detail, and such maps shall be in triplicate, each of which shall bear the signature of the mayor and attestation of the city secretary for identification and authentication; one of said triplicate originals shall be hung in the office of the secretary of the City Planning and Zoning Commission; one other triplicate original shall be hung in the office of the Building Inspector of the City of Katy; and the remaining triplicate original shall be hung in the city council chamber for the use and benefit of the public.

It shall be the duty of the secretary of the City Planning and Zoning Commission to keep up to date the triplicate originals on file in his/her office, and in the office of the building inspector, and in the city council chamber, showing all the changes, amendments or additions thereto, and noting on such maps the ordinance number and date of passage of each such change, amendment or addition.

When definite distances in feet are not shown on the zoning district maps the district boundaries are intended to be along existing street, alley or platted lot lines, or extensions of the same, and if the exact location of such lines is not clear, it shall be determined by the building inspector, due consideration being given to the location as indicated by the scale of the zoning district map.

When streets or alleys on the ground differ from the streets or alleys as shown on the district zoning map, the building inspector may apply the district designations on the map to the street or alleys on the ground in such manner as to conform to the intent and purpose of this ordinance.

Whenever any street or alley is vacated, the particular district in which the adjacent property lies shall be automatically extended to the centerline of any such street or alley.

All undeveloped territory which may hereafter be annexed to the City of Katy shall automatically be classed as lying and being in District “R-1” until such classification shall have been changed by an amendment to the Zoning Ordinance as provided by law or, in the case of a preplanned development acceptable to the City Planning and Zoning Commission and conforming to the Comprehensive Plan for the City of Katy, appropriate zoning classification may be applied to the annexed area after public hearing. If required such “R-1” designation shall be changed by act of the city council within one hundred twenty (120) days after annexation.