Less your $70,000 repair costs is $247,000.Your repairs include things like central air.

At $1650 you are talking 3 bedroom 2 bath, parking, central air/AC and laundry facilities.

My plan is to place a reflective thermal barrier on top of the existing cool coat roof, then add 2 x 4 furring strips for the needed air gap and then 26 gauge sheet metal roof overhanging the eaves by 12" so rain will run off the side away from house, not down the side of the house. 

They've complained about the upstairs bedrooms being hot and minimal air flow. 

View a few units to see what the standard is for the area: stove, dishwasher, range, forced air, boiler, etc.  

The unit itself is only three years old.Sooo I decided to spring for all new ductwork and vents - they also widened the tiny 2 x 12 vents in the larger rooms for better air flow - it took two full days and cost $3900 for a 1600 sq. ft. house.

Five months into a "rehab" and all he had was a burnt out shell with a smashed in door (literally, the door was on the ground and the house was open.) 

I don't deal with the air b and b things much but I believe that status has tax implications too. 

Renting out bedrooms as an air bnb might be over-whelming based on what others have said here.

These sites have very generic and do not take into consideration things like, building codes, zoning requirements, light and air requirements, site orientation, utilities, soil capacity for foundation types, etc.