AbelowSherman Architects have given an historic mansion in Westchester a unique facelift, covering both ends of the architectural spectrum by adding a traditional conservatory and a modern glassy addition. The 16,000-square-foot gut renovation also added a flashy Corten steel staircase and concrete pool cabana to the sumptuous property. From the front, the home is stately and elegant, but a surprising modern twist awaits in the rear.

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