The tallest (and heaviest) all-concrete residential skyscraper in San Francisco is tilting and sinking--since completion in 2008, the 58-story Millennium Tower has sunk 16 inches and tilted two inches to the northwest. This new data comes from the most recent analysis of the building, which has some of the most expensive apartments in San Francisco.
It was originally predicted that the Millennium Tower would only sink six inches during it's lifetime but it a 2010 study showed that the building had already sunk 10 inches. Developers of the tower blame the construction of the Transbay Transit Center for this sinking:
"They built a half-mile tunnel 60 feet underground and next to our building, and they were supposed to [protect the Millennium] – and they didn't," Millennium Partners spokesperson P J Johnston told Chronicle columnists Matier & Ross.