But it sounds like the lease is up and that they're moving out.

.$750. sounds to low for all expenses.

This has to be understood before a corrective action can be addressed.It almost sounds like the bank foreclosed, mixed up the addresses (legal description rules) and you have “owned” the wrong property during this time.I dealt with a similar issue, two halves of a duplex, where the Original legal descriptions were reversed upon the sale of the units.  

@Ronald Daley Househacking sounds like a solid first move! 

I do not share the same sentiment as "Thomas" on this thread in that it sounds like he has had a very negative experience with Section 8 tenants or he knows someone that has. 

It sounds to me like you are asking about the classification for purposes of getting a city business license?  

@David Sillaman Ok so it sounds like cash investments will not give rise to the appreciation/depreciation tax benefits for holding 10+ years and it must be capital gains invested into a fund to get that treatment.If cash and capital gains are mixed into a fund I believe that dilutes the tax benefits.

Now doesn’t sound like you’re a multimillionaire, so if you don’t plan to refinance I would put it in a llc.

If so I wouldn't try to charge them as it has been working this whole time.Also sounds like you need a new AC guy.

@Richard Snyder I have never heard of them, but sounds like a hedge fund back insurance carrier looking to do everything through automation.