Contacting owner who took house off market

[Justin Brown]

Hi, 

I was wondering if anyone has experience contacting a seller that has recently taken their house off the market? I noticed that there was a duplex for sale for nearly a year and it was recently taken down. It hasn't sold, and I was thinking about contacting the seller to see if they might consider seller financing or a significantly lower purchase price. Any suggestions. I see the PO box on the Assessor's site...