The Harvington Ward (Location)

From: Operation High Time, it is situated in the Sime Reserve south of the Potomac border of Washington. The Sime Reserve is the equivalent to the Ancient's Foreign Embassies.
(Source:  Index card file.  Operation High Time -  http://www.simegen.com/sgfandom/rimonslibrary/oht.html)  Place where Mairis stays --- some sort of hotel or inn --- in the Sime Reserve before entering Washington.