.: I read an interesting article not long ago considering how sort of "good intentions" lead to potentially bad/undesired results. 

It is technically possible to have some partners cash out and the remaining partners reinvest in a 1031, but it's highly complicated and usually has undesirable tax consequences for the involved parties.

I think a website "code" idea is going to be undesirable for many of your sellers. 

And yes, back about 30 years ago, here in LI New York, people are concerned with minorities moving into the neighborhood, and telling me be careful who you sell to, not criminals, is somewhat of a code word.Finally OP was asking about problems with assigning contracts in general, and my point was the assignor has no control over the property any more, and the property can be sold to criminals, or undesirables, or minorities.

Inflated ARV's could create an undesirable scenario where the homeowner unexpectedly walks away with less than 20% equity.

Both have a high ratio of Section 8 tenants since both were undesirable prior to 2010 (I bought due to gentrification and being few areas that can still cash flow here).

When we bought multiplexes with tenants in place, most of the undesirables moved out on their own once we established our terms and conditions.  

Is the Congress Heights changing or still an undesirable area and any ideas on how to use the property other than moving in it. 

The poor are largely ostracized because they are in need and they live in undesireable neighborhoods.

Also, a simple google maps street view will show you if a property is undesirably close to a freeway, etc, which would save you a trip to a property you likely will not have interest in.