In the past two years we have completed over a dozen flips, We are holding 20 rental units self managed and 2 self managed Air BnBs.

.✅ House Hacking – How to Live for Free While Building WealthHouse hacking is where you buy a property with multiple units, live in one, and rent out the others to cover your mortgage or generate additional income.

A good broker should be able to tell you a range of rates given specific criteria if you can tell them what kind of deals you are exactly looking at (ex. in central Boston, 10-20 unit, 90%+ occupancy, 30% down).

I'd recommend looking at costs. your build cost is going to be well over other homes because of the fixed costs like slab, Hvac, roof, etc. check the market drivers and weight the benefits of short term versus long term. long term is no furniture and help pays mortgage but at this size it doesn't really cover everything. we didn't find a lot of economies of scale in single family detached. can you build more than one unit?

I would look at the DSCR loan as the first option.By the way, I suspect you are going to be disappointed by any refi appraisals   ADUs typically appraise poorly   JADUs can lower the property value Vs having the space as part of the primary unit.  

I purchased a rental unit and did some private funding in 2016, and I will probably expand this business by doing more deals.

I recently closed on a commercial condo unit (for retail), which is one unit in a building that also has 7 apartments. 

If you are making money flipping, your own project managers, brokerage, etc. you should be able to self fund a few per year also.

They acquired the neighboring four-unit in the 1990s for $150,000.00.

I was also considering the REI expo in February so maybe I'll see you there.You're a self-proclaimed novice but I think many other members of the community would agree that you're well on your way given your potential cashflowing rental and equity.You seem to have a strong position which would allow you to keep growing your portfolio in the next few years.I'd recommend diversifying your RE portfolio the same way you're diversifying with other investments (REITs, Stocks, bonds etc.).