The Secret Service is providing security for a rental property in Middleburg, Virginia, that supplements but does not replace the official vice presidential residence at the Naval Observatory. The Vance family, which includes three children and expects a fourth this summer, has made upgrades including a new fence and chicken coop at the 72-acre official property roughly 40 miles from the additional site. Middleburg has historical ties to presidential retreats, including those used by the Kennedys and Reagans.