We have a project on a university campus that uses pooled parking. The project boundary is relatively tight to the building and we have figured out the share of this building's parking stalls based on area of the building vs. total building area on campus. 

How do we achieve this credit? I have seen the question regarding off-site parking and understand that we have to include them in the calculation. Is the parking area just the area of a standard stall multiplied by the 42 spots that are the project's share? Do we plant shade trees in a portion of the parking area?