(1)
The official City base or plane of reference for elevations in the City is on file in the office of the Director of Public Works and is fixed at a point above mean tide sea level, New York City, as ascertained by the United States Coast and Geodetic Survey Party made in 1934.
(2)
All official elevations hereafter established in the City shall be described with reference to their elevation as compared with the official base in feet and decimal parts of a foot. No grade or official elevation shall be established other than by ordinance or resolution.