During the first season, the NYPD CSI lab is in an old underground building with rustic brick walls. The lab houses Mac's office, a locker room, the autopsy suite, and specialist forensic laboratories. As of the second season the lab is on the 35th floor of a high-rise building in Manhattan. Equipped with glass walls and state-of-the-art equipment, this lab consists of the Supervisor’s office (belonging to Mac, and - for a short time - Jo), specialist laboratories, an observation walkway, a break-room and kitchen, a locker room, and an office belonging to the Assistant Supervisor (first Stella, then Jo), containing an additional hot-desk used by Hawkes, Danny, Lindsay, and Aiden. Part of this second lab is blown up in the season three finale, "Snow Day", but is restored by the beginning of season four.