The Honolulu Police Department is a building that served as the main headquarters for the Honolulu Police Department.
Detective Danny Williams, Lieutenant Chin Ho Kelly and Officer Kono Kalakaua worked there as well before joining Hawaii Five-0 which Lieutenant Commander Steve McGarrett leads. The Five-0 taskforce usually liases with Sergeant Duke Lukela at crimescenes.
The building was destroyed in an explosion that criminal Hillary Chaver arranged during the Season Two finale, Ua Hala but it was later presumably repaired, rebuilt and reopened for business during Season 3.