Our project is a building that literally crosses another building. It consists of a 40 stories building (the LEED building) that comes out of a 3 stories mall (not applying for certification.

The first three floors of the LEED building, due to the fact that is inside another building, have different shapes, and the fourth floow is the one that has the biggest area.

In order to calculate the building footprint, should we superimpose the perimeter line of the first four floors and calculate the area like this?

Any comments would be apprecciated.