Union Square West looking south, including the Decker Building (extreme right), date unknown.

This 1893 building, designed by John H. Edelmann for the Decker Brothers piano company, replaced the company's previous headquarters designed by Leopold Edilitz. Edelmann, notable for his anarchist views and his mentorship of the architect Louis Sullivan (Edelmann came up with the idea for Sullivan's maxim "form follows function"), drew upon Venetian and Islamic influences in the design, which featured balconies, elaborate cast iron filigree, Islamic style terra cotta tiles, and culminated in a domed minaret.

Later, from 1967 to 1973, the Decker building was the site of Andy Warhol's studio the "Factory," which was located on the 6th floor. This was where, in June of 1968, Valerie Solanas shot and injured Warhol, as well as art critic Mario Amaya.