My background in real estate/rehabs has been full gut job remodeling houses that my parents have lived in as well as remodeling my current home, at one point I was a mortgage loan originator (helps knowing how mortgages/financing works), and I'm currently in the process of getting my home inspection certification to help identify issues for my own benefit was well as generate additional income.  

So, really, my gut says start there with the lawyers.Do you have any thoughts on the specific networking strategies you're going to employ?

I've never ran the numbers, but my gut tells me even if you had free land  it would still be more economical to buy an existing park. 

My personal big mistakes have been - buying home with converted garage and only car port (buyers here in So Cal, especially the guys, want/need a garage), bought a house with 55 stairs from street to front door - never again, and largest financial mistake was not going with my gut and chose to go with a new agent to list a multi million dollar property rather than my proven agent or myself.

I've read about self directed IRAs (just learned about them) and I am also totally cool with gutting my accounts.

In my experience, I've had many "wholesalers" attempt to push me crappy deals, I"m not sure if they are greedy or just inexperienced, though my gut says they are just new and don't know what a deal actually is. 

My first instinct would be to take them the deal and explain the calculations, yes or no?

With volunteers help we were able to complete the initial clean and gutting effort but still lot of work needs to be done.

It really depends on the risk vs. reward for you and how much time/money you have on hand.My gut reaction: lawyer up and prepare to sue both the city and land owner for creating hazardous living conditions.

My first instinct is to go for the 15-year mortgage because I can build equity more quickly and I would avoid being highly-leveraged on my personal residence.