Im trying to figure out a solution on how I can keep the tenants occupying the home, while my end buyer can make repairs on both the units for about 2 months to add value to the property and potentially raising rents. 

There are solutions to allow you to get up to 85% LTV cash out on this type of property.

You'll likely be able to get a sense for whether or not they're open to another solution or if they're dead-set on pursuing a foreclosure at this point.   

I think my solution would be to get an export from the utility companies of the last 12 months bills.

I’d recommend keeping your W-2 for a while starting out as it’s the easiest solution.

What I mean is calling them like traditional agents but offering them two solutions: list with me or maybe I have a buyer who will buy from them.

Then move these emails into labels (folders) per each address. 

Remember I always say, fast solutions have slow problems.

If none of those solutions will work, and they are MTM, you can give them notice and terminate their tenancy, repair the stairs and re-rent out the unit. 

There are work arounds to save money but it's always property specific solutions.