Over 2 years ago, concern began to grow when it was discovered that the 58-story high Millennium Tower in San Francisco had settled 16 inches and tilted 2 inches, after just 8 years of being open. The latest reports, according to NBC Bay Area, say that the building is now tilting 18 inches, when measured at the top. That stress on the curtain wall may have caused a 36-story window to crack.