How to Approach an Owner of a Vacant Lot with Letter of Interest

[Jenny Milu]

Hello! 

First time posting on here!  I've been in the researching phase of things for way too long,  there is a house in my neighborhood that has been vacant

for quite sometime now,  I'm interested in approaching the owner to see if he's interested in selling it, was wondering if anyone had suggestions for this

type of communication of what works well and things to avoid?

Thanks!