Assertion: executive mansion | /r/HasProperty | the white house
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Source sentences:
text: Construction began in 1803, eleven years after L'Enfant's Plan for the future "Federal City" (later called "Washington City", then Washington D.C.) had designated an area directly across the Potomac River to be the site of the "President's House" (later called the "Executive Mansion", now the White House) and the "Congress House" (now the United States Capitol).