TAMPA — Someone set fire to the Ybor Resort & Spa early Saturday, authorities said, causing streets to shut down as firefighters controlled the flames.

Tampa fire district chief Greg Reed initially said it appeared the fire started from a pile of garbage in an open-air courtyard and then extended into the building, near the intersection of 8th Avenue and 15th Street. By 4 a.m., the fire was under control, authorities said. No one was in the building during the fire.

By Saturday afternoon, Tampa Fire Rescue authorities ruled the fire an arson. Officials said one or more people illegally entered the building and set fires at multiple locations before leaving. Damage to the building is estimated at $100,000. The investigation is ongoing.

The spa's Facebook page describes it as Tampa Bay's only "fully gay owned and gay operated private men's club, resort (and) bathhouse."

The hotel opened in 2009, catering to gay men. It included a club with a darkened maze room and other "intimacy zones.'' The courtyard included a 50-man hot tub. In 2012, the resort made headlines for inviting delegates visiting Tampa for the Republican National Convention free access to the facilities.

In April, another fire in historic Ybor broke out at a night club on 7th Avenue. That fire was likely caused by someone welding while hanging a disco ball.

Anyone with information about the fire can call (813) 274-7000 or use the anonymous tips page at tampagov.net/arsontips.