Using examples taken from the text give me a list of the first generation of "skyscrapers" located in the city of Chicago.

Early Chicago Skyscrapers is a term which describes the nine buildings in the Loop district of Chicago, Illinois in the United States. These nine buildings were submitted by the US Department of the Interior in 2017 to be considered as a UNESCO designated World Heritage Site. These buildings are the Auditorium Building, Second Leiter Building, Marquette Building, Rookery Building, Monadnock Building, Old Colony Building, Fisher Building, Schlesinger & Mayer Building, and Ludington Building.