They won’t top out until the end of the decade, but iconic new Manhattan office towers are finally going vertical.

And no wonder: Asking rents for beautiful, technologically advanced office space in prime locations are soaring toward $200 per foot.

Meanwhile, the success of JPMorgan Chase’s glamorous new headquarters at 270 Park Ave. is serving as proof of concept for ambitious new skyline stunners. 5

“It is creating a buzz about how transformative new construction is to the city,” said David Goldstein of Savills. “The new construction pipeline is definitely taking shape and the first out of the ground will have pricing and timing advantage.”

One of the earliest will be BXP’s 343 Madison Ave., designed by KPF, with 937,000 square feet. It has a letter of intent with C.V. Starr for

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