The former use as a auto repair could present some concerns and you should find out how the former heating oil tank was abandoned (removed, closed in place, etc). since you are converting this building as opposed to demo so you wont be excavating impacted soil, the principal concern would be potential for vapor intrusion since you're planning on converting to residential. this can be addressed with a system similar to radon system.

@Leilah Davis what is the zoning of the land - can a developer demo the existing building and build a larger MF structure to maximise income?

as we are demoing the drop a huge piece of plaster and ceiling come crashing down.  

Well....I bought one in March 2019 and have only demoed it so far....There is no interest in doing that house for me. 

Divide that into how much money you made.I try to do as little as possible, except calling contractors, paying contractors and I love to do demo.

So many...so many...this was the starting point after demo of the shower I am currently working on.

I'm just trying to get a supremely Ball Park rehab figure for the City of Buffalo for a Rehabbed Duplex.It's actually in really good shape, so no real demo.

Getting into the demo they quickly realized this was a way bigger job than anticipated.

there are no doors so entering is fair game and the city agreed to remove it from their scheduled demo list with the stipulation that I pull permit and show progress of restoration within 45 days of it being inspected by the city. 

if you have existing homes make sure you get permission to replace them from the planning department and building department and health department before you do any demo..