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.  

It typically has pretty good rental demand with UCONN Law School, St.

And are they riskier than a typical conventional loan? 

Typically you cannot 1031 out of a syndication as the partnership (ownership enttiy) must be the one to do it, not an individual investor.2.

The cost of a cost segregation study varies but typically ranges between $1,000-$15,000.

But if your goal is to leave your day job soon, multi family will offer more cash flow typically.

These deals typically require larger cash outlays (50k-100k) per deal minimums.

There are a lot of websites that offer the course online, or if you have a college near you, they also typically offer a class that satisfies the pre-licensing requirement.

Quote from @Fernando Martin-Gullans: Hey y’all, I’m a retail investor with 2 SFH rentals worth a combined ~$650k looking to utilize some of my stored equity to buy more out-of-state properties, but I’m not quite sure how best to proceed given that my interest rates are incredibly low (leaning me away from refinancing) and neither property is owner-occupied (which I believe prevents me from using a HELOC).

I'm speaking of co-living in a typical A or B level neighborhood house, so instead of a 20-25% down payment, we are speaking of a 1-5% down payment.