Path 4-Heat Island effect non roof

Hi, one of my project building (P1) going for LEED CI is located in campus. This building is attached to another building (P2) and even shares a common wall of P1. However P2 is not considered as basebuilding as it is entirely served by a different HVAC system. Therefore my question is if the notional boundary has P2 as well, then should i show 50% of parking under cover for only P1 . As the SS Cr1 paths is for entire base building and in my case the entire project is occupied by tenant and has no basebuilding as such. Any thoughts??