The penthouse is the most expensive apartment in the building to date

The apartments of 1 West End Avenue, Riverside Center’s inaugural condo designed by Pelli Clarke Pelli, hit the market before the building even began making its ascent.

Now just over a year later, the building has topped out and is well on its way to being all glassed in. It also has another milestone to celebrate: Penthouse A, the 5,900-square-foot apex of the 42-story building and the priciest apartment to come to market at 1 West End Avenue to date, has entered contract.

The four-bedroom apartment was first listed in June for $21 million, a hefty sum that includes access to a spacious, private corner terrace with an outdoor kitchen. The sale has yet to close so it’s not clear if the apartment sold for the full $21 million or, in the screwy world of New York City real estate, even more.

The terrace of Penthouse A includes a full outdoor kitchen.

As one of the development’s prized condos is snatched off of the market, another one arrives. Townhome 29B hit the market on Friday for $19.5 million. The condo’s monkier could be confusing: no, it’s not an actual townhouse, but yes, it’s hella swanky. It’s more like a townhouse in the sky, a 5,371-square-foot duplex with a terrace that’s nearly as large.

Closings, and move-ins, are anticipated in the spring.

The townhome’s living area looks on to its equivalently large terrace.