Excavation Complete, Silverstein Prepares to Break Ground at Gold Greenwich Towers

The Port Authority has completed excavation and foundation work at the 3 and 4 World Trade Center sites, turning each over to Silverstein Properties in pursuit of LEED Gold.

After completing excavation at 4 World Trade Center a month ago, the Port Authority on Wednesday finished excavation and foundation work at 3 World Trade Center. Respectively, the sites will be home to Fumihiko Maki’s 64-story, 975-foot minimalist 150 Greenwich Street and Richard Rogers’ 71-story, 1,147-foot 175 Greenwich Street.

The Port Authority performed the work pursuant to the agreement that it entered into with Larry Silverstein back in 2006 (whereby Mr. Silverstein turned over the development of the Freedom Tower and Tower 5- the LEED Platinum Beer Belly Building- to the Port Authority in exchange for the right to build a trio of Greenwich Street towers). The Port Authority has now turned the sites back over to Mr. Silverstein after collectively excavating 400,000 tons of concrete, soil, and rock, as well as constructing an 80-foot deep foundation with 240 streel tiebacks.

According to Janno Lieber, the head of the Silverstein corporate affiliate that’s directing the firm’s redevelopment efforts at the World Trade Center site, construction at WTC 3 and 4 should be in full swing “in a couple of days, and within the next few weeks . . . have 50 workers and 30 pieces of heavy duty construction equipment working onsite. We’re determined to maintain the schedule of our projects so Downtown can be fully rebuilt by 2011.” Together, 3 and 4 WTC will add 5 million square feet of Class A office space to lower Manhattan’s inventory.

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