Curbed DC has renderings of the region's most expensive home, the Williams-Addison House, which will hit the market at $18.5M. The property has an octagonal foyer and a carriage house, but the verdict's still out on whether the manse will out-luxe the 28 fireplaces of Boston's most expensive listing or the lofty interiors of San Francisco's priciest home, which just sold for $28.5M. [Curbed DC]
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