Building zone districts include all public or private streets, ponds, streams and waterways adjacent thereto, whether or not so designated upon the Building Zone Map, including land under water and land hereafter formed by filling, accretion, emergence, avulsion or otherwise. In case a public or private street, pond, stream or waterway as shown on said map forms the boundary between two or more districts of the same class, the district shall be considered as continuous. In case a public or private street, pond, stream or waterway as shown on said map forms the boundary between two or more districts of different classes, each district shall be deemed to extend to the center of the pond or the thread of the stream or waterway as the case may be. A description by metes and bounds of the building zone boundaries is on file with the Village records, to which reference may be made to determine the intention of the Board of Trustees in case of any uncertainty as to the precise location of any building zone boundary.