I’ll bet you not all Trump related contracts will be cancelled. There are many ways to continue a business relationship without having one’s name displayed on a big public sign. Change the name of record. Have a proxy on the board of directors. Allow one small company to merge with another. Hire yourself as a freelance ‘consultant’, vs Key Employee. Same wine, but in a new shiny bottle. Many other techniques, most of them quite legal.
But then there’s always turning Trump Tower into low-income housing, as befitting the street graffiti.
Depreciate the hell out of it and let NYC pick up the bill.
I am sure it could be completely legal to let NYC absorb most of the loss he’s going to face.