It seems that life happens to more than just one resident on the same street. 

Work on Wall Street, so see this stuff all the time although in a different context.

Besides, a property across the street sold for 20k less it's more than livable.

We are a property management company located in New Brunswick, you'll see our signs around and as a matter of fact I started management of a property across the street that is also vacant.

If all the houses were lined up in a row - all on the same street, that would make managing them easier and costs could really be contained, right? 

The challenge is the apartments are quite small for the area and building is ugly (on a main street across from industry and a tree service company storage lot next to building. 

The house I’m flipping now is 1940 and across the street is a historical home built in like 1820.

The home right next door to our sold earlier this year for 180K and it is 200 Sqft smaller and comparable in every way- but it and other homes recently sold on the same street were not listed as comps.

If you were to install check valve on your sewage line (to prevent back up from the street) would you go with plastic one or more expensive cast iron one ?

WE didn't have any at your size, but as we great, we started using Process street - a software that automates a lot of our processed.