You want to buy underwater front, well, you just have to expect it to go underwater
It can be turned around, it is just a choice. Forget trillions of dollars in sea walls (the biggest being the one to keep sea levels down in the Mediterranean, serious dollars). Just use nuclear power stations to desalinate sea water and then irrigate the worlds deserts to produce food and this is the important part, turn the worlds current farm lands into dense, rich bio-diverse forest, problem solved and at far less cost that all those sea walls (you get mass water retention in those forests and new farmlands, improved reflectivity and heat absorption, mass carbon sinks and cities would be surrounded by air cleaning forests). Depending upon where the irrigated desert farmlands are, altered precipitation patterns as a result of transpiration should also flood below sea level, especially the newer higher one, current deserts (think places like https://en.wikipedia.org/wiki/...).
So just a choice, now what one do you think they will make, the care and share one, or trillions of dollars in sea wall profits or losses, depending upon who spends the money and who gets the money and losses, which regions get no protection and of course how many die when those walls fail and they will, one after another with tens of thousands drowning.
In the interim, absolutely do not invest in underwater front property, seriously bad choice. Now the worse prediction still does not allow for a mass methane release from once perma frost regions where decades become mere years.