We Have two building pursuing LEED v2009 NC, both building share an underground parking garage. 

1) Should we include the artificial Lighting in the Parking Garage (serving LEED Building) in the Energy Model? 

2) Should we include exterior Site Lighting in the building's Energy Model? 

3) Should we separate the amount of energy consumption per floors serving each building? (in this case 4 and 1)

According to LEED Reference Guide EAp2 and ASHRAE std 90.1 2007, 9.4 mandatory provisions, its a yes to all three questions. 

But i would like to confirm with another professional opinion.

Thank you,