I toured the property when they were home and they asked me how the living situation was gonna work, which I explained that my loan said that I had to live on the property for a year, and the tenant next door was on a year lease & he was month to month... so he was going to have to leave.

Investing in real estate is a long term way to build wealth.

Loan Origination Systems (LOS): What works best for mortgage and private lending?

While the prices are attractive, I'm concerned with its long term viability.

I'm a licensed mortgage broker and have closed loans with clients out of the country.

Will he and potential buyer of the property be subject to Commercial financing or will the property still qualify for residential 4 unit and under loan types/primary?

It seemed like a long-term play with less price or industry volatility.

So i put in an offer for 10% down conventional loan, $530,000 with 10k back to me for closing costs and it was accepted right away.

Are you asking in terms of lending?

If you Bank/Lender does not allow it you can refinace the mortgage into a DSCR or true Portfolio loan program.