can be a question that can have very opposing opinions depending on the mindset of two investors.. and there are thousands of decisions in flips like that.  

I'm second guessing that decision now and would feel a lot better if I paid someone to review things to make sure it is being done correctly since my friend does not do this as his day to day.An agreement was signed prior to my sale, and assignment of the sale contract and escrow sent the proceeds to my friend.

Be kind to yourself and take a minute to be proud of the progress and good decisions up to this point.

My parents are putting me in charge of the entire investing process because they're too far retired to want to deal with it, so naturally I want to make sure I'm making the best decision for all of us. 

So much opportunity and it's been one of the best decisions of my life.

Which will require a lawsuit and then the court to make the decision. 

Assuming if you're already approved for STR usage you are grandfathered in, correct?

Getting the right people into your SFH or duplex is the most important decision you'll make imo.

It's important to educate yourself on how to prevent it from happening, and then being prepared to act quickly and decisively if it does happen.The problem is pervasive enough in Cleveland that a Google search turned up a lot of news articles, helpful blogs, and other resources.

A lot depends on how correct, or incorrect your installation.