he got the marble out and said, i m going to roll this and see what it does. it rolls ten feet out, slows to a stop, turns around and starts rolling back and picks up speed as it goes past him. it was like, oh, my god. reporter: 60 minutes called its 2017 segment the leaning tower of san francisco and showed the alarming stress gauges and cracks in the building s basement. the millennium s current engineer of record, ronald hamburger, tells cnn as of today the building has sunk and tilted 18 inches. this morning my office filed a lawsuit against the developer of the millennium tower. reporter: after years of lawsuits, hearings, and finger pointing, a retrofit will anchor the building to bed rom which, to the derision of critics, had not been done originally. instead the foundation was built in deep sand. experts determined that adjacent