Like you said, a real estate attorney would be a valuable person to talk to, but here's what I have: Considerations: short/long-term rentals, co-ownershipTo keep your favorable mortgage rate, you can consider a Joint Tenancy or Tenancy in Common agreement without refinancing.

Investment Info:

Small multi-family (2-4 units) fix & flip investment.

Purchase price: $2,900,000

Cash invested: $900,000

Sale price: $4,200,000

Refinance on 2.9mm value. We funded the rehab ...

Last week, HUS accepted my bid on a really good deal and I gave the earnest money in time.

@Joshua FlammIf money is a constraint you borrow against your free and clear property.  

Mid-Stay Rentals (MTR) offer steady money with leases from 1 to 6 months but with okay cash chances and strict rules.

I am also concerned because my goal doesn’t create any money (there isn’t any money that building this house will make). 

We lost money.

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It sounds as if you are trying to do this yourself to save money, which is why your tenant is upset.

If you charge a large fee up front, that money is already gone and you have no leverage for the tenant to comply with paying their last month of rent or returning the unit in good condition.I would consider looking into something like Obligo.