The roof of the Courtyard by Marriott Hotel in Old Town collapsed into itself, folding into the check-in area of the building.
The incident happened at 3:57 p.m. Tuesday on the 2400 block of Jefferson Street, San Diego Fire-Rescue (SDFD) and San Diego Police (SDPD) officials said.
Calls came in for reports of a partial structure collapse on site.
When crews arrived on scene, they found the drain pipe on the roof had collapsed. Water damage was reported throughout the hotel, especially in the check-in area.
Flash flooding conditions also filled the underground garage up with water, though it is unclear whether the water came from a sewer line or down the driveway.
No one was injured.
No further information was immediately available.
Refresh this page for updates on this breaking news story.