"While staying at a friend's loft in the Wall Street district in 1993, Merry Alpern realized that a window in the back room provides a view of a tiny bathroom window of an illegal lap-dance club, where “stock-brokers and other well-to-do businessmen handed over hundreds of dollars and drugs to women in G-strings and black lace." Captivated by the spectacle, the artist spent an entire winter hidden in a friend's loft, spying with her camera. Engaging in sociological espionage, the artist used a fast black and white film to create images imbued with a peep-show quality."
Source
German edition of Dirty Windows. We've included an English translation.