Miami’s Flamingo Park Historic District, which was expanded early this year, may grow further, meaning more construction would have to meet the requirements of the city’s Historic Preservation Board. The board voted this week to add the blocks between Sixth and Eighth streets to the district, overriding city planning staff recommendations. The move must be approved by the Planning Board and then the City Commission. The area in question includes St. Francis De Sales Catholic Church and its church offices, which are housed in a 1948 Modern-style building designed by architect L. Murray Dixon. Dixon designed some of Miami Beach’s most famous hotels, including the Victor, Tides, Tiffany, Marlin, Raleigh and Ritz Plaza.