The good thing about househacking a legal multifamily unit is that lender allows you to use the vacated units of 75% market rent as an income to offset the potential current mortgage.

Has anyone had success finding tenants for rent to own or even contract for deed deals they've done?

Over here the gas company has a "worry free" contract. 

There is no way that I would allow one of my properties to be tied up in contract by someone that cannot show me the money that they are going to close with.On the other hand, if you can find that class B with a real 10 cap, you could sell that in an instant.

You would need to sign a new mutually agreed upon contract/addendum with them. 

Finally, adhere to legal regulations and best practices to protect your investment and reputation.

It's important to do your research and know the current laws. https://law.justia.com/codes/m...Do yourself a favor: buy "Every Landlord's Legal Guide" by NOLO.

There are two ways to remove a squatter: legal and illegal.

I have a property under contract (4 units) I'm shopping around for a mortgage and need some advice. 

To answer your question about suing, I'd start at your legal docs.