The sinking of the Millennium Tower has already sunk over 400 mm / 16 inches. As you would expect this is causing quite a lot of problems, summed up nicely by the NY Times.
The Sentinel data is rather amazing in showing how isolated the worst of the phenomenon seems to be.
Data from the Sentinel-1 satellites acquired between 22 February 2015 and 20 September 2016 show that Millennium Tower in San Francisco is sinking by about 40 mm a year in the ‘line of sight’ – the direction that the satellite is ‘looking’ at the building. This translates into a vertical subsidence of almost 50 mm (almost two inches) a year, assuming no tilting. The coloured dots represent targets observed by the radar. The colour scale ranges from 40 mm a year away from radar (red) to 40 mm a year towards radar (blue). Green represents stable targets.
Here’s the full article from ESA.
Copyright: Contains modified Copernicus Sentinel data (2015–16) / ESA SEOM INSARAP study / PPO.labs / Norut / NGU