Reliable Source: Washington's priciest home just sold. Meet the philanthropist who bought it.

Washington's most expensive home has found a buyer.Philanthropist and businesswoman Adrienne Arsht has signed a contract to purchase the Massachusetts Avenue Heights mansion owned by the late venture capitalist Melvyn J. Estrin. The sticker price for the made-for-entertaining pad was a cool $15.5 million, down from the original $16.5 million, though Arsht wouldn't disclose what the final sales figure was. (When it was listed, the former Estrin home was the only the second-priciest in the city, b...