@Owen DashnerChris Voss author of Never Split the Difference is a better negotiation teacher than Grant Cardone.

It is a daily challenge to navigate the local, county, state and federal governments; local Code Enforcement, Housing Authorities, Department of Real Estate, Franchise Tax Board, Secretary of State, IRS, Dept. of Fair Housing & Employment, HUD...to name a few. 

@Matthew McNeilThe BEST books on Cash Flow which tells you exactly what it is, how to use it, and why you should really study the Internal Rate of Return (IRR) and it's derivatives, is this one: What Every Real Estate Investor Needs to Know About Cash Flow..However, you will need to understand Excel Functions and how general spreadsheets work.The other issue is that the Author, Frank Gallinelli, probably makes the assumption that most of the readers of this book have at least High School Math.I will tell you from my own teaching of Adults, there is NO WAY the average American Adult, including Doctors, Lawyers, etc. remembers Math to the extent of High School.Yes, you don't need to know Pre-Calc, but people get so confused with Math.

Well be the authority.

:https://www.biggerpockets.com/forums/48/topics/549...If you have any questions, i'd be happy to chat with you and bounce ideas off each otherTae Are you per chance the author of "Tae Kim's Guide to Japanese Grammar"?

The zones were created by the State and local authorities. 

They would need at least 60 days for due diligence and would want to have all utilities inspected, talk to local authorities to see if the park is operating in compliance with all state and local rules, etc.  

Call tax authorities, code enforcement and utility companies3.

How do you know he had the authority to sell the house or who he is? 

Some valuable anecdotal and fact based evidence you've provided.Your email to the author really clears things up.