Floor space in a building allocated to residential amenities may be exempted from the definition of floor area, in an amount not to exceed five percent of the residential floor area of the building.

Such amenities may include recreation spaces, including those required pursuant to Section 23-63, or other amenities, including, but not be limited to, co-working areas, library or reading rooms, or music practice rooms, package or storage rooms, laundry facilities, or pet-related facilities.

However, amenity space shall not include floor space for circulation through the building, including, corridors or vertical circulation spaces.  

Amenities provided pursuant to this Section shall be accessible to the residents of the building.