A penthouse for less than a million? In a new condo project? This $999,000 duplex atop Jackson Foundry, a "Civil War–era" conversion on Jackson Street and Manhattan Avenue in Williamsburg, got massively price-whacked yesterday (by $146,000, according to Streeteasy.com). At over 1,400 square feet, that's less than $700 per square foot, almost unheard of in these oh-so-trendy parts — especially when you consider that it comes with intact period details that don't always survive the modernization process, like exposed-timber columns, cast-iron staircases, and rolling fire doors. (Some ceiling heights go up to seventeen feet.) And the huge terrace is yearning for barbecue season. A call placed to someone in the know about the development reveals that "it's a correction, rather than a reduction," but we'll take our discounts where we can. —S. Jhoanna Robledo