Fresh off their $14 million purchase of Le Beau Chateau in Connecticut from the estate of the late, eccentric heiress ­Huguette Clark, designer Reed Krakoff and his interior designer wife Delphine have just plunked down $28 million to buy a formidable townhouse that once housed the New York Observer.

The home, at 54 E. 64th St., is “like a piece of a castle in New York,” a spy said.

Listing broker Paula Del Nunzio, of Brown Harris Stevens, could not be reached for comment.

The Krakoffs recently sold their previous New York manse for $51 million. They also own property in Paris and the onetime childhood summer estate of Jackie Kennedy in East Hampton, which is called Lasata.