officials select add design by daniel levskin anorak text that had never built anything more than four stories. it featured an off center sky scraper with wind turbines. but engineers pointed out that it violated fundamental laws of physics, new york police added the plan was unsafe, and would be vulnerable to terror attacks. and developer larry silver stein who still owns the lease to the site complained about the limits in office space, that could be rented. officials eventually tasked architect david childs with revising the project, this time with input from the new york city police department. >> in 2005, child's unveiled a new freedom tower plan, the first steel beam was installed in 2006, and by 2008, the sky scrapers concrete core began to rise and construction reached street level. in 2009, as part of a new marketing effort, officials changed the name from freedom tower, to one world trade center. three years ago, the tower reefed the half way point, and this summer the spire on top was put in place. one world trade center has signed leases with a chinese company, the u.s. mag