There is still a forest of cranes in Hudson Yards, a 26-acre development on Manhattan's west side. Skyscrapers have mushroomed, seemingly overnight. A new subway extension has made it more accessible to the thousands of people who are expected to populate the area. Even the existing structures are undergoing change. The Brutalist building at 450 W 33rd is shedding its austere concrete facade in favor of slick glass. There, the creative agency R/GA is gut-renovating 200,000 square feet of space to house its New York headquarters—what founder Bob Greenberg views as a new model for connected offices.