Good news. The NY Post, as usual, screwed up the details. This lease has nothing to do with 350 Park Ave, or the adjacent midblock companion tower.
The Morgan Stanley lease is in Park Avenue Plaza, owned by Fisher Brothers, and located across 52nd Street. Park Avenue Plaza is a 1980's-era trophy tower that will probably never be redeveloped.
So the 350 Park Ave. assemblage remains, either using the smaller site, or the expanded site. And the fact that Morgan Stanley is taking a big chunk of short-term space means that the likelihood of Morgan Stanley anchoring a future new tower is probable, perhaps likely.
https://www.bloomberg.com/news/artic...d&cmpId=google
https://therealdeal.com/2022/01/04/m...-avenue-plaza/