After snags and a redesign, the team working on arresting significant future settlement of the 645-ft-tall condominium tower has declared the $100-million fix a success.

The team for the revised pile upgrade of the 645-ft-tall residential building expects to complete the work to stem settlement by the end of September.

The structural engineer for the tower's perimeter pile upgrade has proposed a scheme to reduce the number of piles and speed the delayed project to completion by the end of 2022.

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.

Shimmick Construction successfully completed the 36-in.-dia pilot pile casing installation at San Francisco’s Millennium Tower, proving the efficacy of the initial step of a less-disruptive construction method designed to allow the paused foundation fix to resume.

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.