What postcards or letters would you suggest sending to owners of vacant properties? What should the letter say?

Note that you should send a series of postcards and/or letters. I would send a postcard first saying simply you are an investor looking for properties in the neighborhood and noticed that theirs was vacant and you would be interested in purchasing it and relieving them of the burden of the vacant property - make them feel their pain and see the relief you offer. The second mailing could be a letter that expands on the benefits of letting you have the property. You really want them to owner finance, sub-2, or L/P so start working them that way. Marketing gurus say that it takes at least 4 letters.