As you know, STL can be block by block, so you really have to know your stuff.  

Also would colored envelops be a good way of catching a distressed owners attention?

Comps one mile away can be totally irrelevant.....in a different subdivision which can have drastically different values, and in many cases 2 blocks away can have vastly different values.  

Bob lived a colorful and adventurous business life.

More after pics..New block fence and gate...Living room. ..Hallway...1/2 bath

This business is basically blocking and tackling and doing what other people are not willing to do.  

Also, the leach lines can get blocked too.

As a real estate agent I try to discuss a lot of metrics (DOM, %list price, number of expired/withdrawns) at the regional as well as neighborhood or block level, so I hope my clients take this as another piece of information to consider when investing.  

Will all actions be blocked by the bank? 

On top of that you can go from a great buy to a bad buy in one block because of school zones.