I'm having some difficulty in figuring out if my project should be certified as one single building, or different building (and certifications) on a campus.

The project is of an university campus, that has 3 buildings in a row, 2 of which will be demolished and 1 (the one in the middle) will be maintained.
In the place of the 2 demolished buildings, will be constructed new buildings. They have a shared underground parking lot and are also connected by a bridge on the 4th floor.
The building that will be maintained is between the 2 new buildings, under the bridge and over the parking lot and will not be renovated or connected to the new buildings.

My question is, if the new buildings are connected to each other (sharing the underground parking lot structure) but not to the existing building, can I pursue a singular certification and exclude the existing building or do I qualify for a Campus approach?