Old vacant run down house, only lead is tax records

[Ryan Detzel]

There is this really rundown vacant house that is in a great location and it's surrounded by some really nice houses that have all rebuilt them over the years and I would love to flip it if I could get a good deal on the land but I can't seem to get in touch with the owners. By the looks of the tax record, it's owned by three people (probably an inheritance), the taxes are paid every year so they didn't forget about it but the only address listed is a po box. Should I just write a letter, what would I say? Is there another approach to this maybe to get more info about why it's just vacant?