This is an old building, flat roof, right against the road where it will get more wear and tear.

Thanks @John, I guess I'm more confused about the details-- like do I do I have them do the application as a pre-screen and then have the shortlist people do the background check?

Should you offer to pay a flat fee if a deal is closed? 

All Zoom calls, conference calls, has her two screens set-up in our office.  

Contractor : Usually they charge between $250 to $300 per square foot for a flat (ground level addition) : thats retail : our people charge between $175 to $200 per sq ft (for ground level construction) licensed and bonded.

& tenant screening is gonna be tougher. 

Once you have your list of contractors in place, and a robust tenant screening and rent collection system, you will be off to the races.

Will it be a flat fee or a percentage of each project?

@Andy Wilson Forgot to add to my post to make sure you screen the tenants properly.

Although there are circumstances going on at the moment that are out of anyone's control, generally, it's not difficult to avoid evictions; thoroughly screen, invest in a quality market and treat tenants like human beings.