More than 350 Brooklyn Navy Yard construction workers gathered to watch the last steel beam hoisted 250 feet atop the 17-story, 4-Star Dock 72 office tower at a topping out ceremony. When completed in 2018, the 675,000-square-foot asset will be the first ground-up office tower built in Brooklyn in more than 30 years. A 13,000-square-foot food hall, 15,000-square-foot wellness center, 200-person conference center and open lawn with tables games round out about 35,000 square feet of amenities and public space with direct access to a new ferry terminal servicing the city.