I buy gentle used ones from FB or craigslist.

Never invested because he grew up with me in Brooklyn, prior to the Gentrification movement.

It's now under contract and we have just gone through the comprehensive inspection which found signs of foundation movement.

There is also some interesting information on money movement. 

I am personally very interested in his progress and forward movement especially if it is directly related to Peter and Joe's coaching program which charges a 15K "are you serious" fee PLUS an extra 1K a month on marketing.

First of all, I am still fairly new to BP, so please be gentle...So here is the situation.  

I'm looking to purchase a quadplex (house hack) and the numbers seem to make sense.The issue or concern I'm having is, several years ago (approx 7) there was grown movement , (possible sinkhole) but current owners sued insurance after patchy work.

This allows you and your investors the opportunity to maximize return on property movement, defer taxes completely with 1031 exchanges, and pay capital gains rates rather than ordinary income rates on those you don't 1031.  

And has any historical correlation been coincidental or is there a theory of why real estate price movements and stock market price movements would be correlated?  

Blames the Property Manager for wind, hail, storms, tornadoes, winter storms, freezing pipes, foundation movement, dead grass, etc...