Notwithstanding the retroactive provisions of section 27-994 of this article, in high rise buildings and existing high rise buildings, no switch, lock or device of any kind shall be installed on any floor on or above the street floor on any elevator car or elevator hoistway door, except elevators used exclusively for freight, that shall prevent opening of such doors by anyone not having a key, unless fire department access to cars and hoistways is provided for by a city-wide standard key as described in reference standard RS 18-1. Existing high rise buildings shall comply with the requirements of this section on or before April first, nineteen hundred eighty-seven.