Honolulu firefighters battled two separate fires in Waimanalo and Waikiki.

Eight units and 30 firefighters responded to the first two-alarm fire shortly before 9:15 p.m. Thursday at a vacant multi-use structure at 41-761 Mahailua St.

The fire was brought under control just after 9:30 p.m. and extinguished by 10:30 p.m.

Honolulu Fire Spokesman Capt. David Jenkins said the structure was unoccupied at the time of the fire.

The second two-alarm fire occurred at Scandia Towers at 155 Paoakalani Avenue in Waikiki just before 12:20 a.m. today. Nine units and 35 firefighters responded and observed smoke and flames emerging from the fourth floor of the 11-story residential building.

Jenkins said a man was in the unit at the time of the fire. He was alerted to the fire by a smoke alarm and escaped uninjured. Other residents evacuated after the building’s alarm system was activated.

Firefighters brought the fire under control and extinguished it by 12:34 a.m.

The causes of both fires are under investigation. Damage estimates have yet to be determined.