Willis, C. (1995). Form Follows Finance: Skyscrapers and Skylines in New York and Chicago. New York: Princeton Architectural Press.
Willis’s argument that skyscraper form is driven by land values, zoning, and speculative real-estate cycles, and not by pure architectural intent. The book supplies the analytical frame the Evolution of Coordination Nodes uses to read the skyscraper and the trading floor as the +M form’s concentrating node, and to date the market form’s contemporary decoupling from the emptying of Chicago’s trading pits (2021) and rising urban-office vacancy rates.