The phrase "floor area" refers to the total space available on a floor or a particular level of a building, including both usable and non-usable areas. Full definition
All the exhibition galleries of the new museum will be involved, on a total floor area of over 60,000 square feet. (inexhibit.com)
It's also delivered absolute emissions reduction against a 2006 baseline, meaning total emissions were down despite significant growth in floor area. (wemeanbusinesscoalition.org)
A common way for manufacturers to expand the total floor area of a cage is by adding multiple levels. (petbusiness.com)