Haven't pretty much all US cities with substantial stocks of out-dated pre-war office towers been converting them to res./hotel for several decades now?
To my knowledge, that's absolutely nothing new.
The much tougher nut to crack is converting those blocky, giant floorplate post-war office boxes to residential uses.
We have some examples of the latter here in Chicago, but they're still much more the exception than the rule. The two major examples I'm aware of both had some special circumstances.
Mid-Continental Plaza's conversion of its upper floors to residential had everything to do with the building's commanding (and protected) views overlooking millennium Park and the lake.
The old Montgomery Ward's HQ tower conversion was spurred by the company going kapupt, and also because it was located a fair bit outside of the Loop, in a much more residential area of river north.
55 E Monroe (Mid-Continental Plaza):
source:
https://www.skyscrapercenter.com/bui...t-monroe/14135
The Montgomery:
source:
https://www.skyscrapercenter.com/bui...ntgomery/10312