I'm working on an energy model for a 4 story lab building that has 4
stories of parking beneath it.

Am I correct that for the ASHRAE baseline building, I would select the
system that falls in the "4 or 5 floors or less than 75,000 sq ft" for
the office portion of the building, and then just set up a common
ventilation system for the 4 levels of garage to mimic garage
supply/exhaust unregulated energy? The garage levels don't turn my
building into an 8-story building do they?

Thanks in advance!

James Hansen, PE, LEED AP