![]() The building has continued to settle vertically to its current 16 in. of vertical settlement predicted by the designer over the lifetime of the project, by the time the TJPA started work in 2010, the Millennium Tower had already settled 10 in. But Boule says seven years of data collected by Arup before excavation began on the Transit Center showed that instead of the maximum 6 in. Tower geotechnical engineer Langan Treadwell Rollo declined to comment, as did Arup, TJPA’s engineering consultant. To suggest that this is caused by anything other than the adjacent construction is a red herring.” Stephen DeSimone, president and CEO of DeSimone, counters that “buildings for decades have been founded on this Colma layer. “Millennium Partners’ poor design decision is the cause of the tilt and excessive vertical settlement of the Millennium Tower,” Boule says. He points out that the Salesforce and 181 Fremont towers-also adjacent to the Transit Center-are supported on piles drilled to bedrock. That foundation is inadequate to prevent settlement of a building with the weight of the Tower.” This heavy structure rests on layers of soft, compressible soil. He says the Millennium Tower “is made of concrete rather than steel, resulting in a very heavy building. In a prepared statement, TJPA legislative-affairs and community-outreach manager Scott Boule says the design was paired with a concrete slab foundation that doesn’t reach bedrock 200 ft deep.
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