Ghirardelli Square is a landmark public square with shops and restaurants and a 5-star hotel in the Marina District of San Francisco, California, United States. A portion of the area was listed on the National Register of Historic Places in 1982 as Pioneer Woolen Mill…Ghirardelli Square is a landmark public square with shops and restaurants and a 5-star hotel in the Marina District of San Francisco, California, United States. A portion of the area was listed on the National Register of Historic Places in 1982 as Pioneer Woolen Mills and D. Ghirardelli Company.