If you're over 1% it's usually a good sign.Aside from that CAP, ROI, and Cash flow can vary from investor to investor depending on what assumptions are made.For example I like to see >8% CAP, >20% ROI assuming 20% down conventional financing, or net cash flow over 750$ for a deal.However there are many variables and exceptions.....

Assuming the lender allows someone to assume a note (That's a BIG assumption), all they own is the note.

This assumption is true but in my experience COVID has definitely had an impact on multi family prospects.

@Philip Hernandez, without knowing anything about the asset or your assumptions, we can't give you any valid input.  

Many believe unrealistic assumptions and often apply those assumptions to the wrong property classes.In our OPINION (always verify yourself!)

So may have been an assumption oversight?

An assumption I made based on the phrasing of the OP.

It would be my assumption that turnkey in that market would be tough to make money on.

In my case I was hoping my history with an US company maybe helps.About the difficulties with the Green Card: I was under the assumption that a spouse is eligibel for a Green Card?

Now your current lender has advised there is a lien against your husband that predates the lender's lien and the lender is demanding repayment.First, if my assumptions are correct, as Tom Gimer already wrote, the matter probably would not be covered under your title policy because the lien apparently attached after the Date of Policy and would therefore be excluded from coverage.