Which address should I send a letter to?

[Michael R.]

Looking for advice on which address I should send a "I want to buy your house" letter to.  I was out driving for dollars this morning and came across a prospect.  Got home and did my research and found the tax assessor has the owners mailing address different than the prospect address, but only about a mile away.  So I ran a search on this mailing address and that house is owned by someone else with a completely different name.  I found this to be strange, but whatever.  Since this other address is shown to be owned by someone else, should I send the letter to the prospect address, or stick to the address I got from the tax assessor website?

Thank You in advance.