Condos right on the beach should be torn do an after 40 years. All that saltwater.
That might be a bit extreme, but maintenance cannot be neglected. The really old ones may be beyond repair.
If they are built with a full frame support at ground level and no parking garage, they should have avoided the constant air contact with the pillars.
Take all the parking garages and almost completely enclose them, keeping much of the salt air away from the supporting elements.
Residential buildings in Japan are rarely over 30 years old. Their entire model is about new stuff.