(a) This section applies to:
(1) an office building;
(2) a wholesale or retail mercantile establishment or store;
(3) a workshop or manufacturing establishment; or
(4) an industrial plant.
(b) Each facility subject to this section and § 791.002 that has a lot area greater than 6,000 square feet shall provide, in addition to the fire escape required by § 791.002, one additional fire escape for:
(1) each 6,000 square feet of area in excess of the initial 6,000 square feet; and
(2) the area in excess of the largest multiple of 6,000 square feet contained in the facility’s lot area if that excess is more than 2,500 square feet.