 Administrative and ceremonial buildings were finished in 1985.In the late 1980s, the FBI and the National Security Agency built a tunnel under the compound for espionage purposes, but it was never successfully exploited due to FBI agent Robert Hanssen disclosing information about the operation to the KGB.In September 1994, during his visit to the United States, Russian President Boris Yeltsin and U.S. President Bill Clinton inaugurated the new ceremonial building of the Russian Embassy, at Mount Alto.