Iirc, there are scientific estimates that Greenland's ice sheet alone would raise sea levels by 24 ft if it melted.

12-15 ft may really not be enough for very long.

So let me ask you, is a house really a product meant to last forever and ever, or should it be something that you get maybe 30-40 good years out of it and then dispose it and rebuild?

I don’t get this idea where if a building can’t stay in a spot forever, it should not be built at all. Why not build and enjoy while you can?

When the land floods it floods, you move on. Until then don’t worry about it.

Not to mention being 15 ft above sea level doesn't help if the shore keeps washing away. A lot of the houses being moved/abandoned on coasts now are above sea level, but the sea level is undercutting the cliffs they are built on.

My parents bought a house 11 feet above sea level. The right combination of high tides and storm surge could easily flood that any time. It hasn't happened yet, but the sea level could rise a foot or so in the next generation, making flooding more likely every year.

It’s already probably not enough to weather a 25-100 year storm (looking forward to compute storm frequency).