How do they do that?

There’s a clock tower in Baker Street which I used to hear chiming all the time. I grew up around the corner. I went there with my daughters yesterday and noticed it suspended mid-air. I’m very impressed with modern engineering. They managed to knock the building out from underneath it, and yet still keep it suspended in the air. How the hell do they do that? It looks great though, I recommend you go down there and check it out. It’s at the Regents Park end of Baker Street if you don’t already know.