But the road crosses 3 other properties for which there is no legal access.  

Kiavi does a good job with a lot of things, but they tend to be a bit more "vanilla" and stick to their guidelines/checklists.

You’ll need to treat it like a business—handling tenant management, accounting, legal compliance, property maintenance, and more.That said, when done correctly, it’s a powerful tool for building wealth!

In total, including money lost from rent, legal fees, and repairs, the situation cost almost $30k.

Will the title company put this property under our LLC name, and won’t be required to legally inform HUD/tax authorities. - will it influence property taxes once we move to conventional loan in 3 yrs? 

Do not rely on it for legal advice.

The real prohibitive costs come from the legal, compliance, and reporting requirements of registering a security.

@Asher M.Possible, yes but like your lender pointed out it's going to be difficult to pass the self-sufficiency test (SST) for a legal 3-4 unit property.

If you want them to leave, provide them legal notice to leave.

Consider Hiring a Legal Expert- German property law can be complex.