(a) For the purpose of regulating front yards, for the purpose of further regulating side yards of corner structures, and for the purpose of regulating the alignment of structures near street frontages, building lines, as set forth on the Zone Map which accompanies this Zoning Code and which is hereby declared to be a part hereof, are hereby established. The Map designations and the Map designation rules which accompany such Map are hereby declared to be a part hereof.
(b) Between a building line and the street line, no structure or portion of a structure extending above the established grade may be erected. In a Class U1 District, a one-story unenclosed porch may, however, be constructed between the building line and the street line.
(c) Where a building line is shown on the Zone Map as an existing alignment line, the alignment of the structure existing along such frontage shall determine the building line.
(d) On any street frontage in a district, where no building line is designated on the Zone Map, the location of the building line shall be as follows:
(1) In a Class U1-A1 District and in the Class U1-A2 District, the minimum distance between the building line and the established street line shall be not less than 100 feet. The Planning and Zoning Commission shall have the power to increase this distance when it finds that it is desirable to do so, to improve the relationship of the proposed building to adjacent structures considering the average minimum setback on a particular street to establish the distance of the building line back from the street line to be twenty percent of the average or normal depth of the lots having their front lines on such street frontage.
(2) In Class U1-A3 and U1-A4 Districts, on a street frontage on either side of a street between two intersecting streets, but excluding the frontage along the side line of a corner lot, the distance of the building line back from the street line shall be twenty percent of the average or normal depth of the lots having their front lines along such street frontage, but such distance back from the street line need not be more than fifty feet, but in no case shall it be less than fifty feet.
(3) In a Class U2 District, on a street frontage on either side of a street between two intersecting streets, but excluding the frontage along the side line of a corner lot, the distance back from the centerline of the street shall be at least fifty feet.
(4) Certain exceptions because of unusual land contour conditions may be specially approved by the Board of Zoning Appeals and by Council.
(e) For lots where no building line is designated on the Zone Map or on a recorded plat and which have no immediate street frontage, the Planning and Zoning Commission shall have the authority to designate a lot line as the front line of the lot, which shall be deemed to be the "street line" for the purposes of front yard standards. In making this designation, the Planning and Zoning Commission shall take into consideration the orientation of existing and proposed buildings on the lot and on surrounding lots.
(Ord. 3053. Passed 3-14-00.)