Bad idea to flip a rear lot house with easement to street access?

[Andrey Rudenko]

Hello BP!

I am looking at buying a house (SFR) that is in the rear of someone elses lot. The address looks something like 123-r Main St, where "r" I think stands for "rear". Anyone had experience with houses like this? Are these much tougher to sell? What sort of discount should one expect on a house like this compared to "regular" lot with all other things being equal?

The house has easement through the front lot to access the street.

Thanks in advance! 

Andrey