A possible solution for this project that comes from the past. 
You imagine a tower like this, located in that position but with 2,5-3 million sq ft and 1,350-1,500 ft tall.
With this solution there would be more space for the new Penn Station.
1964, concept for Clive Entwistle's Madison Square Garden
proposal in association with Charles Luckman Associates.
http://www.grahamfoundation.org