San Diego , California , had originally been selected as host city for the convention . Columnist Jack Anderson , however , discovered a memo written by Dita Beard , a lobbyist for the International Telephone and Telegraph Corp. , suggesting the company pledge $ 400,000 toward the San Diego bid in return for the U.S. Department of Justice settling its antitrust case against ITT . Fearing scandal , and citing labor and cost concerns , the GOP transferred the event — scarcely three months before it was to begin — to Miami Beach , which was also hosting the Democratic National Convention . It was the sixth and , to date , last time both the Republican and Democratic national party conventions were held in the same city ; Chicago had hosted double conventions in 1884 , 1932 , 1944 , and 1952 , and Philadelphia in 1948 . The RNC did not return to San Diego until 1996
Democratic National Convention
1972 Democratic National Convention
1972 Republican National Convention