Tracking down a current owner.

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Hey all! There's an amazing vacant and off-market parcel I'm vying for currently for a project I've been working on and in spite of best efforts (letters, door knocking, phone calls, etc) myself and my agent have been unsuccessful at reaching the current owner. I did some digging on her and apparently when her husband passed, she inherited several commercial lots, a couple condos and houses, plus several parcels in Iowa.

Any thoughts on how to make positive contact with this lady, without being a stalker?