I'd appreciate some insight from some local investors.

Also, I am a local Realtor, so if you have questions about the different areas of DFW, let me know..

They hold title, and the mortgage and promissory note were attorney drafted and filed at our local county. 

I live in SW Montana where there is a strong STR market and am considering buying a lot locally (2.5 acre overlooking the river/valley/mountains) where I could set up 2-4 Tipi's and rent portable bathroom/washing station for the lot.

Often times if you work with a local bank or credit union, you could get lower fees and a fair rate.

This is the value of having someone who has local experience.The company you said, if they are some "remote" company, I guess they could provide the things that you need and save money, but I would hesitate to feel confident if they do not have regional experience and that you would be left vulnerable if issues arise with the design later on. 

It's also worth speaking with a local real estate agent to identify the best neighborhoods for rental income potential.

Like law office, day spa, or some other small company space?

Start local.

But being a local it seems like the prices are only going higher.