Impose a supplemental property tax, increasing over time, on buildings out of compliance with current requirements, so that upgrade or replacement becomes comparatively more desirable vs. doing neither than it currently is.
Or, just have a fixed window to achieve compliance or the building is condemned.
Cool. Let’s start with NYC subway stations. Public infrastructure should be ADA compliant yet NYC permitting will hammer a small business for a toilet two inches out of compliance when the city itself has massive issues that are ignored.
Or, just have a fixed window to achieve compliance or the building is condemned.