They may argue they couldn't pay you because they just made a $10,000 improvement to the house. 

Having a vision for future projects like the ones you mentioned are great, but learning the ABCs of RE with a small investment (initial down payment - since you only need 3.5%-5% down on a primary) is the best way to sharpen your skills.

Months passed and ABC kept saying that house was “very close”.

I recommend compiling an analysis/presentation stating that your parents will save an "x" amount by working with you instead of "ABC" local property managers.

They cited insurance reasons, which could very well be true, but many residents felt it as a big "f you" Now folks from outside the community could argue this was an entitled stance from the residents, to feel they had access to this private land when they didn't, and that on the face is certainly true.

Since you said you are selling your building I’d argue you already have been a real estate investor.

You absolutely want to be concerned with this.I would just argue what you're concerning yourself with today may be totally different in that 10-20 year period.

You could argue that they are using the tour to scope out the building.

Surely some will argue for more restrictions while others will argue we need less impediments to tourism.So, if you're going to buy I would buy soon.

Argue with me all you want.