We lived in DC before moving to PA. In our neighborhood in Shepherd Park, Washington, DC, there was a building covenant for Shepherd Park. All of the houses had to brick or stone w/slate roofs. There was one house, a large white clapboard house w/slate roof that was the residence of the first Mayor (Walter "Boss" Washington, and incidentally a Negro) of DC in our neighborhood. There was a tale, that in the basement of this residence, there was a tunnel running all the way from the Potomac River. True, I don't know, but interesting.