Dilworth Park is a public park and open space along the western side of City Hall in Center City, Philadelphia. The one-half-acre park opened to the public on September 4, 2014. Dilworth Park opened in September 2014. It is named in honor of Richardson Dilworth, who served as mayor of the city from 1956 to 1962. The current park was designed by KieranTimberl…Dilworth Park is a public park and open space along the western side of City Hall in Center City, Philadelphia. The one-half-acre park opened to the public on September 4, 2014. Dilworth Park opened in September 2014. It is named in honor of Richardson Dilworth, who served as mayor of the city from 1956 to 1962. The current park was designed by KieranTimberlake, Urban Engineers and OLIN and replaced Dilworth Plaza, designed by Vincent Kling in 1972.