I was on the 52nd floor of the Mori Tower in Roppongi Hills when the earthquake struck. You can get a sense of how much the tower was shaking from the curtains moving and the people screaming. The earthquake itself was scary, but the psychological fear of the tower collapsing etc was stronger. Well after the earthquake stopped, the building continued to sway back and forth. We ended up waiting about 1 1/2hrs for the lifts to start up again.