No building shall be erected or altered in any A-1 residential district so as to place its street wall nearer than twenty three feet (23') from the street line; no building shall be erected or altered in any A residential district so as to place its street wall nearer than twenty three feet (23') from the street line; provided that:
(A) Where a block is occupied or partially occupied by buildings which existed in the block at the time of the passage of this chapter, the average of the distances of the street walls of buildings, from the street line, shall be the established building line; but no building shall be required to set back in any case more than twenty three feet (23') in any A-1 residential district, nor more than twenty three feet (23') in any A residential district.
(B) Where a lot on which a building line setback is required, adjoins a district with a smaller or no setback requirement, the buildings on said lot, for a distance of not more than fifty feet (50') from the district line, shall be required to observe only one-half (1/2) the setback that would otherwise be required for first said lot.
(C) Where the continuation of the front line of one or more lots in a business district forms the front line of one or more lots in the same block and in a residential district, the buildings in the business district shall, along that frontage, conform to the setback requirements of the adjoining residential district, but no business building shall be required by this section to set back more than fifteen feet (15') from the street line.
(D) Where owners of all properties in a block petition in writing for the establishment of a building line within that block, which building line differs from that which would otherwise be established by the provisions of this section, the board of appeals may, after due notice and hearings, recommend to the village board of trustees the adoption of the building line proposed by the petitioners. (Ord. 37, 9-11-1941)