As used in this act, the term “state zoning area” shall include and be the following described area in the city of Topeka, Kansas: Beginning at the centerline of west Seventh street and its intersection with the centerline of the north-south alley extended between Kansas avenue and Jackson street; thence westward along the centerline of west Seventh street to the center line of Polk street; thence southward along the centerline of Polk street to the centerline of west Fourteenth street; thence eastward along the centerline of west Fourteenth street to the centerline of Jackson street; thence southward along the centerline of Jackson street to its intersection with the centerline of west Fourteenth street and the centerline of the north-south alley extended between Kansas avenue and Jackson street; thence northward along the centerline of the north-south alleys extended between Kansas avenue and Jackson street to the place of beginning.