According to KGO News, there was an explosion at 10:45 tonight, in a building on Van Ness Avenue at Washington Street. The condominium was under construction, and no one was inside when the top-floor explosion occurred.
The blast is thought to have been caused by a space-heater which had been left on, near a propane tank. Glass was blown across eight lanes of Van Ness Avenue, and destroying a restaurant awning on the opposite side.
Though the explosion blew out the glass on two sides of the building, and caused some structural damage, there were no injuries.