The blocks of Hudson Yards are the current hotspot for office construction in New York City, with supertall after supertall rising from nothing. But Midtown East might be the only location in Manhattan where major office projects are rising alongside existing fabric. While One Vanderbilt is only beginning to rise above 42nd Street, work is substantially further along at 425 Park Avenue, where Norman Foster’s vision is now climbing past the stump remaining from the site’s former occupant.