The former Marine Police Headquarters was constructed in 1884, comprises a main building, a stable block and signal tower (commonly known as Round House). The Signal Tower is the most unique building within the compound and was constructed to provide time signals to ships in the harbour. Its use diminished in 1907 when the time ball apparatus was removed to Signal Hill. The former Marine Police Headquarters Compound was declared a monument in 1994.前水警總部建於1884年，整組建築包括主樓、馬廄及報時塔（俗稱圓屋）。報時塔可謂整座水警總部最具特色之建築，為海港船隻報時。其作用於1907年大包米的訊號塔落成啟用後而消失。前水警總部於1994年被列為法定古蹟。