We have a project with 2 commercial towers being designed to certify in CS, on the same land owner 2 residential towers (not LEED) are located.

However the parking area is 100% of the land in 5 underground levels.

The parking design is as follows:

Basement 1- 100% land area - Residential Tower 1 - No LEED
Basement 2 -100% land area - Residential Tower 2 - No LEED
Basement 3-100% land area - Commercial Tower 1 - LEED CS
Basement 4-100% land area - Commercial Tower 2 - LEED CS
Basement 5-100% land area - Commercial Tower 2 - LEED CS

The question is how to define the LEED baundary in basements 1 and 2 do not apply to our certification CS?

Please ask your help.
regards