High Quality Content by WIKIPEDIA articles! Centre Square is an office complex located in Center City, Philadelphia, Pennsylvania, United States. The complex consists of two high-rise towers: the 417 feet (127 m) Centre Square I and the 490 feet (150 m) Centre Square II. The concrete towers are the twenty-fourth and fifteenth tallest buildings in Philadelphia, respectively. Designed by Vincent Kling Associates in the 1960s, Centre Square opened in 1973. The complex is credited with shifting Philadelphia`s downtown office district from South Broad Street to West Market Street. A tenant since 1975, management consulting firm Towers Perrin is Centre Square`s largest tenant.