In 1942 the Soviet government bought the building from Nathaniel Luttrell, Jr., the grandson of the original inhabitant. While originally purchased to become the USSR embassy's chancellery,[6] it would officially house the offices of the USSR Trade Representative until the end of the Soviet era.
The Lothrop Mansion is listed on the National Register of Historic Places,[7] and is designated as a contributing property to the Kalorama Triangle Historic District.[8] It is currently vacant.