Machinery Hall (built in 1901) and the Main Building (built between 1891–1893) are located across the street from each other at 33rd and Federal Streets northeast of the location of the former Comiskey Park. The buildings are both Victorian era red brick and granite structures built in the Romanesque revival architecture style that were designed by Patton & Fisher and their successor firm, Patton, Fisher & Miller. The buildings were constructed with the aid of philanthropy by Philip D. Armour, Sr. On the first landing of The Main Building's main staircase there is a stained-glass window dedicated to Philip D. Armour, Jr., located on the first landing. The two buildings are located adjacent to the Dan Ryan Expressway and Chicago Transit Authorityred line from which they are highly visible. The original cost of the Main Building (3300 South Federal Street) in 1892 was $500,000 ($13.2 million today), and Machinery Hall (100 West 33rd Street) cost $150,000 ($4.3 million) in 1901.