I'm going to practice your "finding people behind on their taxes approach. 

@John HixonThanks for the kind words@Mark KvamThe following people I think should be consulted regarding your mobile home park purchase@John Fedro@Curt Smith@Ken RishelMaster lease options in general is where we "guaranteeing the net operating income NOI" on a master lease, have an option to purchase based on NOI, and then turning around the investmentAll leases are turned over to you as a master tenant and you in turn sublease  outThink of a poorly managed apartment building, with a low NOIYou increase rents over time and decrease expenses and efficiency of managementWith a master lease option, you can sell your option or exercise your optionMobile home park negotiations, I would think that that's a late sale and purchase agreement with a large down payment would be the most prudent way to approach it, you may need private money to execute the  sale and purchase agreement@Bill GulleyMight have a few ideas too

There are two approaches most commonly referenced on the forums:a) Cash for keysb) Eviction

Can I approach a (different) bank and ask for a home equity, without disturbing the current mortgage (since I did a quit-claim)?  

As you've probably started to see, flipping houses and owning/managing rental properties are two very different approaches to investing in real estate.  

The way I approach this is I stop being friends with people who aren't growing first.

@Justin Brownthe way I see it is that loan against 401k can be very cool and useful feature, but it needs to be approached carefully and number of things must be considered:1.

Specific suggestions could be; find a house you like and approach the owner.

I personally take the approach of separating both sides of any business I am involved in. 

@Michael Noto @Michael NotoundefinedWe are approaching distressed property owners and sending them direct mail.