The Miami CSIs were firstly, in the backdoor pilot, stationed out of a broom closet next to the MDPD's bull pen. They were given their own building prior to the start of the first season. Originally dark and technical, this building housed Horatio's office, Megan's office, specialist labs, and a locker room. During the fourth season a government grant meant that slanted glass walls, multiple modern labs, an interrogation room, and a new locker room were all constructed. Horatio's office is not seen following the lab's reconstruction—although a state-of-the-art ballistics suite was added, acting as Calleigh's office. The lab has reinforced windows and shutters to protect against hurricanes and tsunamis.