Two building entrances

I have a project with over 300,000 SF in an urban area that includes an attached parking garage. We have one main entrance for pedestrians on the main street corner and one entrance into the building directly from the parking garage. Would I draw a radius around the pedestrian entrance and also the other entrance, even though someone must drive into the parking deck to reach that entrance? The entrances are on opposite sides of the building. They really could not be further apart. Also, can anyone point me in the right direction of where to begin with the attached parking garage? I haven't had one on a LEED project before but it seems it would help me with several credits, namely energy efficiency because the footprint is so large with minimal treated air.