I'm curious, were you already operating these units as MTR before Dallas enacted the STR restrictions or did you pivot STRs to MTRs because of it?

At least in this region.

While residential development is generally restricted in these areas, there are specific circumstances under which it may be permitted:Special Mixed-Use Districts (MX): In certain M1-2 zones, residential use is allowed when paired with a residential district under the MX designation.

Not understanding how and when I can raise rents and other operational restrictions is what scares me.  

Any recommendations for a good area to consider in the Tri-State or eastern PA region?

Section 8 voucher has income restrictions can be found https://www.huduser.gov/portal....  2nd website you should be exploring PHA website to determines eligibility for the program. 

I wouldn't go for a condo, as the HOA fees and restrictions could affect your ability to rent it out, and the resale value will always be lower than a comparable SFR.

I’ve used the large national and regional banks as well as smaller local ones.

It would be great to discuss opportunities and projects in both of our regions.

There is an Hoa that requires minimum 6 month leases but that was only restriction.