There are a lot of options and I think this community is really great for getting a clear idea of all the creative options that exist that sometimes don't even come to mind until you put it out there!

Aside from verification of existing license status in the state of operation, what other means do you advise a GC be vetted before signing a contract for work? 

If you bought it and told them you were going to live in it and don't and rent it out, you could be committing mortgage fraud.

@Joey LlamasAt the risk of committing a sin on this site where the gospel says you must abide by some metric -- I say, keep it simple, especially if this is your first one.

We are closing a deal in Dayton, Ohio in 2 weeks and contractually are obligated to allow the existing tenants to continue occupancy for at least 60 days. 

Ideally you also took photos before they moved in to avoid them claiming the damage was pre-existing. 

Typically what I see is that if there is adequate notice and there's a likelihood that the nights will be booked by other parties then I would allow for the refund (myself as the Host), but if that is loss income because you have made the commitment to use the property during that time that is a cost of doing business on your end.

I know these months are normally busy with family commitments just wanted to get it on my calendar if we were still having a meeting.

I familiar with the process but how would it differ from a regular BRRR on an existing property?

Based on the information you provided you may be able to squeeze in a 2nd ADU due to it being an existing multi-family address.