I'd have no problem with it ideologically, but building science-wise it would be difficult. Structure would be enlarged due to more wind-loading, more elevators are necessary to make up for the increased units but each of those cannibalizes space on each floor leading to either unpleasant wait times for residents or lost GFA to the developer, etc. etc. etc.I actually wouldn't have a problem with 79 floors here.
Also, am I the only one who finds the 70's Girl Guides building a tad charming?