On Monday, Larry Silverstein will cut the ribbon to officially open his new 3 World Trade Center, the third office tower he has developed there since the 9/11 tragedy. At 80 floors, it tops out at 1,079 feet.

“It’s very expressive of masculinity, strength and power,” Silverstein told me of the 2.5 million square-footer. “The steel trusses are part of the façade work.”

Indeed, the Rogers Stirk Harbour + Partners design is at first glance similar to 4 World Trade Center right next door by Fumio Maki.

But where Maki is a minimalist, 3 WTC asserts an industrial aesthetic akin to the Tribeca neighborhood, with steel exoskeletons and bullnose edges on view.

The expansive lobby has reflective but unfocused glass walls, and a mullion-free glass curtain wall that encompasses entrances to Westfield’s restaurants, shops and the subway.

The lobby was also redesigned and refreshed from its initial reveal some 10 years ago.

The center core structure has floors from a giant 60,000 square feet down to about 31,000 square feet.

Recent lease signers include: IEX, which is moving to 58, while the terraced 60th floor was leased along with floors 61-64 by McKinsey & Co., both first reported by Post colleague Steve Cuozzo.

GroupM’s 700,000 square feet includes half of a massive one on the 17th floor that is split as an amenity with other tenants. The 76th floor and its terrace is still available. Asking rents are in the $80s per square foot.

With 40 percent of the building leased, Silverstein says, “It’s not bad on the day of opening.”