Honestly, the white house is a living structure. Its been constantly renovated as long as its stood in order to meet the changing needs of running a country. Its what happens with most old structures, additions get made, more damaged or outdated sections get replaced, and ultimately the structure changes over time.

It also makes for some brilliant imagery of what Trump is doing to the country and he knows it. He's both literally and figuratively tearing down and replacing the seat of power, in ways that will be technically difficult, expensive and time consuming to restore or replace. And like any structure that gets a poorly conceived modification, his changes to the country won't be torn down and reverted to their earlier state, they'll most likely be dressed up, the most egregious flaws will be reworked, and some of Trumps changes will remain for a long time without update. Ideally all of Trumps changes will be torn down and a completely new structure will replace them, but that's ambitious, expensive and disruptive, plus if the wrong architect does so the entire structure can be far worse than it started.