Dos and Donts, suggestions, tips for letter to vacant property owner.

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I decided to pursue a property that I referenced in a thread linked below.  I was hoping to get some suggestions regarding what to put in the letter.  Most specifically, whether or not to reference the neighbor connection between my relatives and his late mother. 

Any dos and donts for the letter?  Is handwritten a must?

Original thread

I truly appreciate any input you have to offer.