Hello everyone, I have been buying properties in OR and TN and am looking to expand into NW Arkansas after reading up on landlord laws and recent growth in the area.

You will have to check your local laws but I am not aware of a requirement to post to the MLS.

There are a lot of laws in california regarding buying at foreclosure and if you are not an owner occupant it gets some 2nd chances I believe.

She has substantial equity and wants to invest with me but her ex (common law marriage) wants 250k to take his name off.

It sounds like you may have already read this, but Real Estate Law and Asset Protection by David Willis is a book written specifically about this scenario and specifically regarding Texas Law.

As a Ny'er We chose to invest completely OOS as Ny landlord tenant laws are not the best if you are considering holding long term. 

Also, something the state though is looking to make a law on now though.

I can't point you to the specific law, but he has personal experience.

Any tips for good accountants familiar with OH real estate law?

It may be  law maybe not, but it isn't going to be enforced.Treasury Department Suspends the Enforcement of BOI that Forces Small Businesses to Report Personal Details About Their Owners to the FedsThe U.S.