I always UW a deal so that it works as a LTR but then I can have options with MTR/STR in that market.

I assume that's the market you are chasing if you are looking at options where you will be leasing to PHA voucher recipient tenants.

Is there any benefit of one option over the other? 

Hope this helps anyone else considering this funding option.

Selling outright: depending on how much profit you've made, this may also be an option (speak with an accountant).

Another option I’m considering is finding a mixed use building with residential rental space above and do a single tenant commercial space below.

I'd suggest reaching out to a few different lenders to see what options are available to you.

I don't have a guidebook through them(or at all), but if I were to create one, I would probably use touchstay or another 3rd party option like that. 

One other thing to note about the h/st Trinidad corridor that often gets lost, its most of the area isn’t that metro accessible, when the city was growing and they hadn’t fully built out navy yard/the wharf/noma yet that was ok, but with the city shrinking and other newer more appealing options I do worry that the metro accessibly plus the age of the neighborhood will be a real long term issue.

I ended up offering it as a lease with an option to buy.