A few years ago a friend decided to demolish his old house due to extensive and expensive water damage to the ground floor.
Could this be the explanation for the damage?
A spanking new apartment building now stands at the spot of the old bungalow. There are no signs of any water damage so far. A giant lithospheric dehumidifier may have been used during construction.
There is no end to the add on and perks developers promise these days.