This 50-year-old mansion in Bethesda, Md., underwent a lengthy modernization - including two years of design work and five years of construction.It now has a sleek, modern design.(Craig Westerman)This 50-year-old mansion in Bethesda, Md., isn't your typical 1970s house.It's not just huge (15,000 square feet) and very expensive (at $12.5 million, the most expensive property now on the market in Montgomery County).
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