The city issues a revised building permit for a perimeter pile upgrade scheme that reduces the number of piles from 52 to 18.

Engineers working on the retrofit to stabilize the building developed a plan with 18 piles instead of 52, as had been considered earlier.

Using a modified method, Shimmick’s Legacy Foundations restarted work on the troubled perimeter pile upgrade of the ailing Millennium Tower in San Francisco.

Coverage related to the COVID-19 pandemic continued to attract the most page views, but there were also several engineering failures that garnered much attention as well.

By installing a pilot pile for the settling Millennium Tower's troubled foundation repair, Shimmick Construction hopes to prove the efficacy of revised construction methods so that work can continue without triggering accelerated building settlement.

The team working on the troubled foundation fix of the settling Millennium Tower has switched gears again due to equipment troubles.

San Francisco Dept. of Building Inspection advises the Millennium Tower homeowners association to “refrain from resuming” the pile foundation retrofit for the settling 645-ft-tall condominium until a new approach to the fix is reviewed by the city.

Work on the nearly $100-million perimeter pile upgrade on the 645-ft-tall residential tower to prevent significant future settlement follows the resolution of litigation.

With the lengthy and complex permitting and approval process complete and almost all the other details worked out, construction could begin in mid-November on the estimated $100-million fix for San Francisco's 645-ft-tall Millennium Tower, which has settled more than 17 in. since its completion in 2009.