Fire crews today remained at the scene of Sunday’s four-alarm warehouse fire in San Francisco’s Bayview District monitoring for hot spots, a fire department spokeswoman said today.

The fire began at about 11 a.m. Sunday in a furniture refurbishing company at 1526 Wallace Ave., and spread through a total of seven warehouse buildings in the industrial area, fire spokeswoman Lt. Mindy Talmadge said.

The blaze was declared under control at 12:16 p.m. Monday, Talmadge said today. However crews remain at the site to watch for flare-ups.

The city’s Department of Building Inspection has red-tagged five of the severely burned buildings, she said.

Marijuana was found growing in one of the buildings, but police Sgt. Wilfred Williams said this morning that the narcotics unit investigation found that the marijuana is being grown legally, “for medicinal purposes.”

Talmadge said fire crews from across the city were called in to assist with the four-alarm fire, as well as a three-alarm fire in the Haight-Ashbury neighborhood, reported about two hours after the Bayview blaze.

“The one thing that was very, very challenging was having two greater alarms going on simultaneously,” Talmadge said. “We were able to handle it, but it really depleted us.”

Talmadge said that at some points during the day, “we only had 12 engines available to respond to the rest of the city.”

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