The ceiling is drywall under trusses so that is a free fire zone, the only question is the switch by the door for the light.
Reno, the inspector is not going to be happy if you notch the tiebeam. That is structural.
I also suggested the motion sensor but they want a switch too. This is not California and these folks don't mind spending money to keep the fan going all day long.
I suggested putting a bell box on the back wall (the service is there anyway on the outside) and put the motion sensor there. That could be pretty tight to the ceiling and they could come through the soffit and fish over the block wall to that. Then come out of there to a ceiling fan box. Use that as the J box to pick up the exhaust fan, hold a ceiling light and over to the switch. If they decide to go with a paddle fan with a light kit later they will be good to go.
