TOPIC: Apartment building inspection

Just got a call to inspect a 10 unit apartment building. Listed as residential. Open for any input. I sort of figure it as 10 mini homes or 5 houses,,but want to be fair on pricing. Plus any liabilities that might arise since it is an apartment building. Actually it is an old school house.
Input welcome. Thank you,
Tim

How many square feet is the entire place? How many hvac systems are you looking at? How many total man hours do you estimate? Are you hiring an HVAC, Plumber or Electrician to take with you? Just helping out with a few of the questions I know the guys will ask

Tim, are you doing it as commercial? 

Yes it is commercial. I was told it was listed as residential but the assessors page states commercial. So this is another world, I am not a certified commercial inspector. I beleive that is required.
This is for a friend. Would it work to do a walk through and not actually generate a formal report? He was mainly concerned with asbestos and structural possibly HVAC. It's an old school house converted to 10 appartments.