Flames could be seen coming from the roof of the Bellagio.
Traffic on the Strip began to improve after firefighters were able to control the blaze.
The portion of the building that was on fire was the roof over the south entrance to the Bellagio shops.
The fire department arrived to the area at 10:50 p.m. after receiving a call four minutes earlier.
Authorities have not offered any details about what started the fire.
He says damage was limited to the roof of the Via Bellagio annex.
Pres. Trump allows states to block Planned Parenthood money
This move is the latest in a growing list of moves that are slowing chipping away at access to reproductive health care services. She said women's "worst fears" are coming true.
The fire was contained to the exterior roof of a high-end retail section of the building. They added that strong winds had helped the fire spread quickly.
A rooftop fire broke out at the Bellagio hotel and casino in Las Vegas late Thursday night, prompting a temporary shutdown of the Strip, ABC News reported.
The cause was under investigation.
Haydu said in the statement that the location of the fire made access hard but it was knocked down in under an hour.
There have been no reports of injuries.
Las Vegas Boulevard was briefly closed as a result of the fire.