A fire early Sunday in downtown Las Vegas was the Nevada city’s biggest in 25 years, the Las Vegas fire agency said.

Firefighters returning from a call shortly before 1 a.m. saw smoke coming from a condominium complex and discovered that a building under construction was already fully involved.

Residents from the complex were awakened and evacuated, and personnel eventually numbering 140 were called to fight the fire.

It was largely controlled by 6 a.m., though crews remained on the scene all day to monitor hot spots, Las Vegas Fire & Rescue said.

Ten or more buildings were destroyed or damaged, the fire agency said. The accounting of the exact number of residences, businesses and vehicles destroyed or damaged would probably take until Tuesday, the agency said, but it declared the fire the city’s biggest involving occupied dwellings in 25 years.