More likely once the 90 years expires the area discovers that it is not actually capable of doing the replacements required. Of course, pretty much only suburb

More likely once the 90 years expires the area discovers that it is not actually capable of doing the replacements required. Of course, pretty much only suburban areas have infrastructure/buildings built over that short an interval. Constructing 90% of a major city’s high rises in a decade would be a construction boom unlike anything the western world has seen in a lifetime.