Fire destroyed a section of San Francisco's Pier 29, a building scheduled to be used for the upcoming America's Cup.
At least four ladder engines responded to the call of a roof or top floor burning along the city's Embarcadero around 1:50 p.m. Wednesday.
Firefighters were on the roof of Pier 29 battling the blaze by hand until pieces of the roof began to fall onto the sidewalk below.
No one was injured but firefighters used hoses from ladders to fight the flames.
The fire reportedly broke out at a construction site which is also scheduled to be the home of the America's Cup.
The Pier 29 site was considered a vital negotiation piece to bring the America's Cup to San Francisco in 2013.
The building is located in a highly trafficked area between the Ferry Building and Pier 39 right along San Francisco's bay front. between Broadway and Chestnut Street.
Organizers of the sailing race were said to be prepared to spend upwards of $55 million to restore piers along San Francisco's waterfront.
The cause of the fire was not immediately known.