A sixth-floor unit in an Upper East Side building where Jackie Kennedy Onassis grew up is back on the market for $1.39 million.

The two-bedroom, one-bathroom co-op is in a building, at 125 E. 74th Street, by architect Lafayette A. Goldstone, who created 640 Park Ave. and 730 Park Ave. as well.

The sunny unit comes with a fireplace, an open dining room/living room layout, high ceilings and hardwood floors.

The nine-story building replaced three row houses and comes with a one story limestone base, Corinthian-style limestone pillars and iron balconies.

Dominic Paolillo, of Compass, has the listing.

There’s another two-bedroom in the building, on the second floor, that is now asking $1.05 million, down from its $1.25 million asking price in 2014.

The current brokers Martin Eiden and Michael Kochman, at Core.