Apple’s ambitious plans for its so-called “spaceship” campus have finally been given the green light by Cupertino council, paving the way for construction to begin before the end of the year. The building cost of the new head quarters was reported to have jumped from $3 billion to $5 billion earlier this month, which is more money than it’s taking to build the new World Trade Center. The entire 176-acre site in the city of Cupertino, California, will be redeveloped with sustainable, state-of-the-art office, research, and development facilities. Apple first brought the idea of this second campus to Cupertino in 2011 and has since experienced some delays, which isn’t unusual for such a massive project. Apple doesn’t expect employees to start working there until 2016, according to its project update.