By the sounds of it you are not seeking money, you gave proper 30 day notice the month to month would not be renewed past X date and you are now beyond X date and you want your property back. 

Additionally, I would post, call, and leave a message stating that you need to come inside the property to inspect with proper (our lease states 24 hours) notice.

yes, we have had similar situations and have not had any issues (SE MI) in gaining possession of property where the lease was properly terminated. 

We hate the tutorial, but know we have to go through it to understand the control and functions properly or we will surely be slain in an unforgiving and merciless death.  

Do you trust that they made a proper executive decision to save you money and them time, by doing a smaller fix than originally estimated.

I would contact the relevant county court (Kings if Brooklyn, New York if Manhattan, etc.) and ensure you serve the proper notice and such.

However, if you have the means to manage 4 "park" owned homes and have properly understood and accounted for the associated expenses, you should be just fine.

Either way, this wasn't handled properly a year ago.

So find the value of their investment, and value of management, and value of finding the deal, etc and break it down into percentage of value to find proper shares, or if they want total passive, just borrow off them at a reasonable interest with balloon clause and keep the deal myself.

Yes I would definitely sell and re-invest in a cash flow positive property, and make sure you understand how to properly calculate cash flow and even add some margins in there for higher interest rates/lower rent.