I first asked Bayocean alumni if they knew who owned three houses shown in a 1957 photo from the Maxwell Collection at the Salem Public Library. They identified the one in the middle as that of Lewis and Hilda Bennett, but no one knew who owned the cabin at the top of the hill. Given the nature of gravity, that one seemed like the best candidate.
After following many leads down rabbit holes, I was looking at Webbers' What Happened At Bayocean and noticed a photograph on page 11 of Lewis Bennett holding another photograph of a house in shambles that the caption said fell into the sea. Bennett's property was in the foreground sans house, because he'd already deconstructed it. Looking at a Bayocean Park plat map I saw that the property just above Bennett's was lot 26 of block 57.
At the Tillamook County Pioneer Museum, I found the original of the photo that Bennett was holding. A note on the back said "Last House In Bayocean." It had been taken by Hershel Stuart on February 4, 1958, and given to the museum on September 6, 2006, by Mabel Johnson.
When the Notdurfts viewed the damage wreaked by the 1952 storm from Cape Meares, they assumed their cabin was lost and never went back. The 1999 edition of Bayocean: The Oregon Town That Fell Into The Sea the Notdurfts purchased doesn't have a caption saying that their cabin was the last to fall, so Otto and Maldeenna died not realizing they had that distinction. And even though they know their cabin had been lost, they kept paying taxes until Tillamook County stopped charging them. It's still in their name.