Purchase price: $141,500 Cash invested: $29,000 Single family home in West Side of Worcester, MA; conveniently located one block from Worcester State University and less than 2 miles from Worcester Regional Airport.

Where can I find what the houses sold for a block in NYC ?

you're WAY overthinking thisAre you being MALICIOUS in your actions?

Street by street and block by block have very different characteristics that could significantly impact your ability to command premium rents. 

Visit ask questions get lost and grab lunch at some hole in the wall.This way when you get mugged two blocks from the property leaving a liquor store because you can't find anything else... you'll have saved yourself from buying something that looked fantastic on paper.On a slightly more serious note...the realtor will make you feel like you're a deal on a good house and you'll be pumped.The inspection will make you feel like you're buying the biggest money pit you've ever seen. 

Two adjacent blocks can have drastically different appreciation outlooks. 

If so, then the owners of the front property cannot (legally) block access.If there is not an easement then adverse possession may come into play. 

Solid credit, solid financial, solid business plan.... mysterious blocks to underwriting.Private B2B loan underwriting is a cresting wave. 

Automatic stays can be blocked by courts if there is an in rem order placed.

Its really block to block out there.