Section 15-1-509 - Major street plan; preserving integrity of map; building permits; necessary findings; specifications(a) To preserve the integrity of the official map, the governing body may provide by ordinance, subject to appropriate eminent domain proceeding, that no permit may be issued for any building or structure which encroaches upon land located within the lines of any street as shown on the official map. The ordinance shall provide that the board of adjustment, which the governing body may create by ordinance, has the power, upon an appeal filed with it by the owner of any such land, to authorize a permit for a building or structure within any mapped-street location when it finds that: (i) The property of the appellant a portion of which lies within the street lines will not yield a reasonable return to the owner unless the permit is granted; or (ii) Balancing the interest of the municipality in preserving the integrity of the official map and the interest of the owner in the use and benefits of the property, the grant of the permit is required by justice and equity. (b) Before taking any action, the board shall hold a public hearing thereon. If the board decides to authorize a building permit, it may specify the exact location, ground area, height and other details and conditions of extent and character and also the duration of the building or structure to be permitted.