Two insurance companies have signed leases for Silverstein Properties’ 4 World Trade Center, taking up 69k SF of the 2.3M SF office tower.

Global Atlantic Financial Group has signed a 44k SF, 15-year lease for the 72-story tower’s 51st floor, doubling its current HQ's size at Silverstein’s 7 World Trade Center, the Commercial Observer reports.

Silverstein World Trade Center leasing director Jeremy Moss repped the landlord in-house with CBRE’s Mary Ann Tighe, Steven Siegel, David Caperna, Steve Eynon, Adam Foster, Evan Haskell, Robert Hill and Ken Meyerson. Savills Studley’s Erik Schmall and Michael Mathias repped the tenant.

Currently in a 10k SF space in 48 Wall St, Bermuda-based insurance firm Validus signed a 16-year, 25k SF lease for half of 4 WTC’s 47th floor.

The CBRE team worked with Silverstein’s Camille McGratty to rep the landlord in-house, while Validus was repped by CBRE’s Eric Deutsch and Jonathan Cope.

Now 80% leased, the tower has scored more than 200k SF of new leases over the last few weeks. Earlier this month, Zurich American Insurance Co signed a 132k SF lease for three floors, and in May, financial tech company Hudson River Trading signed to take two floors.

In addition to several TAMI businesses—including PadillaCRT, MediaMath and New York Mets broadcaster SNY—the tower’s anchored by the City of New York and the Port Authority, which ground leases the site to Silverstein. [CO]