A few days ago, one of the units experienced a toilet backup.

We have 60 rentals12 air bb units, Ohio  and Fla. 15-20  flips and wholesales, between buy and sell close at any point. 

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?

Our goal is to acquire an additional 200 units by the end of 2025 and connect with like-minded individuals passionate about real estate.Outside of my professional endeavors, my interests and hobbies include weightlifting, off-roading, hunting/fishing, and searching for the next big deal.What's your Real estate testimony, and how can we work together to build success?

I cannot comment is $100-120 is high as I do not know your market, and I do not know size of unit, bed counts, etc. 

Institutional Borrowers (With In-House Capital Markets Team): We work with many institutional clients with 1,000's of units under management that have in-house capital markets teams.

I'm interested in investing in multi unit properties and potentially get into house hacking.

Give them a couple of options, they already know the unit got foreclosed, most people move to avoid the hassle. 

Have you confirmed that he is still in the 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.