It shall be the duty of the owner entitled to the beneficial use, rental, or control of any building used or intended to be used as set forth in § 6-701.01 where fire escapes are required, or any building in which 10 or more persons are employed, as set forth in § 6-701.02, where fire escapes are required, also to provide, install, and maintain therein proper and sufficient guide signs, guide lights, exit lights, hall and stairway lights, standpipes, fire extinguishers, and alarm gongs and striking stations in such locations and numbers and of such type and character as the Mayor of the District of Columbia may determine; except that in buildings less than 6 stories in height, standpipes will not be required when fire extinguishers are installed in such numbers and of such type and character as the Mayor of the District of Columbia may determine.