Classifying neighborhoods is difficult because locations can vary greatly "block to block" as most are saying.  

I won't let my past be a road block, but thank you for replying!

 Just looked at a two family down the block from where i llive.

They walk the ~6 blocks to the Avenue where there are lots of hipster restaurants etc.

Dorchester, Chelsea, Revere, and some areas of Roxbury and Hyde Park still seem to have some opportunities, but most of those neighborhoods are block-by-block dependent. 2.

Could be roof leak, or plumbing pipe leak, maybe a drain.

(This may be more Florida specific as the A\C will become inefficient when coils are dirty, run more often, possibly decrease the (life cycle) of the A\C, and cause algae or dirt to clog the drain line.The A\C in condo's in Florida is located over the water heater frequently, once water backs up and drips down it will short out and due to liability risks cause you to replace the water heater.)Jeremy,  Private message me your email and I will send you some RE contracts with private/personal info omitted. 

The source of the leak came from a crack in the drain pipe in a unit 3 stories up.

If the house and mortgage is a drain on their finances and underwater, I think a short sale or deed in lieu of foreclosure might be the best way to get rid of it.  

I haven't (might tomorrow cause I need to see these bubbly walls) but I doubt the agent will allow me to schedule a showing since its under contract.There's one a bit smaller a few blocks over, but it has a 1 car attached garage.