506.4 Single occupancy buildings with more than one story.
The total allowable building area of a single occupancy
building with more than one story above grade plane shall be
determined in accordance with this section. The actual
aggregate building area at all stories in the building shall
not exceed the total allowable building area.
EXCEPTION:
Basements below the first story above grade plane need not be included in the total allowable building area, provided
each basement does not exceed the area permitted for a building with no more than one story above grade plane.
506.5 Mixed occupancy area determination. The total allowable
building area for buildings containing mixed occupancies shall
be determined in accordance with the applicable provisions of
this section. Basements below the first story above grade
plane need not be included in the total allowable building
area, provided each such basement does not exceed the area
permitted for a building with no more than one story above
grade plane.