No person shall erect, construct or maintain any billboards or sign boards in any block of any street in which one-half of the buildings on both sides of the street are used exclusively for residence purposes without first obtaining the consent in writing, of the owners owning a majority of the frontage of the property on both sides of the street in the block in which such billboard or sign board is to be erected, constructed or located.
Such written consent shall be filed with the Building Inspector before a permit shall be issued for the erection, construction or location of such billboard or sign board. The word "block" used in this section shall not mean a square, but shall embrace only that part of the street bounding the square which lies between the nearest intersecting street on each side thereof. (1955 Code. §985.06)