No it wouldn't - too far to get to anything else. It would be expensive just because it is still NYC and a high demand area, but it wouldn't be the most expensive because while it is close to one great thing about NYC it is far from all the others.
Because Central Park is literally surrounded by skyscrapers that don’t have parks in neighborhoods with below average park coverage other than Central Park. It’s the exception that proves the rule.
It’s also not that safe and requires its own police precinct.
I think the encapsulation probably refers to the 'city in a building' aspect, i.e. residents have most needs satisfied within the building, and rarely need to leave the building itself.
A giant tower in a park just encapsulates everyone and leaves the park empty.
Easily observable and any why the campus model took root.