Washington Block is a Chicago Landmark building located in the Loop community area of Chicago, Illinois, United States. Designed by Frederick and Edward Baumann it was built between 1873–1874 in the aftermath of the Great Chicago Fire of 1871. It was designated a Chicago Landmark on January 14, 1997. When completed, Washington Block was one of the tallest buildings in the city of Chicago and is described as a rare example of the "isolated pier foundation" (see below) which contributed to the foundation of knowledge that has made Chicago the birthplace of the skyscraper.The building has limestone facades and originally included an exterior staircase that led to a second-floor corner entrance. The lobby has a curving hardwood staircase. Today the first floor is occupied by a 7-Eleven and the second floor occupied by Carter Legal Group PC.