667 Dark Avenue is the location of a high rise apartment building in the city where the Baudelaires originally lived. Dark Avenue is in a highly fashionable district, and as a result, both the building and the street it overlooks are constantly redecorated to suit the times. It is here that the Baudelaires reside over the course of Book the Sixth, The Ersatz Elevator. The building's penthouse apartment is owned by Jerome and Esmé Squalor. Jerome purchased it after receiving a cryptic letter from Jacques Snicket, which urged him to acquire the apartment and never ever sell it. The reason for this entreaty becomes clear when the Baudelaires discover a secret passageway in one of the building's elevator shafts, which connects the penthouse apartment to the plot of land on which the Baudelaire