Fred Leighton Building

Normally, our eyes widen at an apartment that measures 3,455 square feet inside, but this Upper East Side penthouse offers that much space outside. It comes in the form of one massive wrap-around terrace on the main level plus a smaller terrace off the upper-level bedroom suite. If that wasn't enough, the interior measures a whopping 4,020 square feet, including five bedrooms, a dining room that can seat 30, a massive skylight, and floor-to-ceiling glass windows wrapping around, and more. Located at 45 East 66th Street, it's asking $12.5 million.
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