If thats your only fear then rest assured.

Post a three day notice, or whatever is allowed per your statutes, as well as notices of non compliance.

Have look at your lease; I would serve notice-non payment and non compliance. 

I want to spearhead the development process and get the project to the permit stage and am willing to put up some money, but I don't want to invest a significant amount unless I have assurances that I won't be cut out of a deal he decides to make with someone else down the road. 

I assure you it is not that.  

But she said she could see, which I knew she couldn’t but was trusting her.She assured me that her broker would be part of the deal in all aspects and would help. 

Make him an offer, but also assure him how you're looking forward to taking care of the tenants and that his legacy will live on in the park.

I most assuredly do not want to have to go through buying another home and moving at my age.

@Cameron AndrewsIt would be wise to speak to your tax professional before you do anything.I tell my clients nothing increases a compliance fee like investing in foreign assets/foreign companies.You'll want to make sure the juice is worth the squeeze. 

Most importantly you need to convey confidence and assurance you are a player and not just wasting their time.