Yellow letter? Personal Letter?

[Jonathan Emery]

Hi,
I am getting ready to write yellow letters and send them out. I just found out today that the 2 unit house next to my 3 unit is vacant. There are no for rent signs and I know the place needs work inside and out after speaking to my tenants. I did speak to this owner years ago but since lost his phone number. I did find his mailing address on the assessment records. Should I approach this as writing a "random" mailing list letter or should I make it more personal since we spoke once before and I own the property next to it. He may be curious as to how and why I have his mailing address if its personal. Please let me know your thoughts. I hope to mail a letter to him tomorrow after receiving responses.

Thank You
Jon