Giants announce jersey advertising in new Cruise partnership Groundwater loss from adjacent construction has been blamed for the problem by the tower’s developers, while geotechnical experts say the key is that its foundation is not rooted in bedrock. The top nine all weigh more than 300-million pounds, but the only one that’s leaning significantly is the Millennium. Turns out that at an estimated 686 million pounds, the Millennium Tower is the third heaviest building in the city. “Clearly, the most density and the tallest buildings are centered in that downtown San Francisco area, and that's where we see the most calculated cumulative settlement from all of those buildings together," he said. “I looked at every building in the Bay Area, so just under a million buildings,” said U.S Geological Survey research geophysicist Tom Parsons, who estimates that over the last century, 3.5 trillion pounds of development and human activity – including the subsidence tied to loss of groundwater - have led to an estimated settlement of three inches across the entire Bay Area. The Millennium Tower may be the most recognizable sinking building in the city, but one researcher says earth-based and space-based observations confirm the entire downtown area around it is sinking as well.
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