This is a 1903 map of the current location of the Department of State, on C St. between 21st and 23rd. Obviously, it was very different back then, with New York Ave. running through where the building stands today.
Two things really jump out at me when checking this out. One is the dog pound that’s located at 23rd and C St. The other is the Herdic-Phaeton building at 19th and E St. Doing some quick Wikipedia research, I learned that this was a local stagecoach company that ran transportation around the city, and two of their stops still stand today on the east side of the Capitol.