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[quote user="blue streak 1"]If you buy a building, new home, anything don't you hire someone for an independent inspection and in the case of multi million codo hire an engineer to vet the plans ? Let the buyers beware ! We have a case here where 2 different persons backed out of a purchase after results of an inspection ![/quote] Sounds good. For small buildings. The Millennium Tower and San Francisco has a combined pile and raft foundation (CPRF). It is complicated to calculate as you need to get right the pile-soil interaction, pile-pile interaction, raft-soil interaction, raft-pile interaction. I think that is out of reach for a civil engineer not being a specialist in geotechnology.  I have more than 30 years experience as civil engineer in structural design including pile foundations but not CPRF. I could check the input into the software and must then believe that the software calculates correctly. Part of the input are soil properties. Here I need to believe that they are correctly evaluated. I can only check if they are out of the ordinary for the area. And again, a correctly executed CPRF is as good as piles on bedrock. Regards, Volker Edit: in July 2017 a study was published that state at the tower is safe at that time but settlements have to be monitored: <a href="https://sfgsa.org/sites/default/files/Document/MillenniumTowerSafetyReviewReport.pdf">https://sfgsa.org/sites/default/files/Document/MillenniumTowerSafetyReviewReport.pdf</a>
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