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More than 20 people were displaced after a three-alarm fire damaged five buildings near 23rd and Capp streets Saturday morning, authorities said.

No tenant injuries were reported, but one firefighter was being checked for dehydration, said Mark Gonzales, the deputy chief of operations with the San Francisco Fire Department.

The fire started in a lower-level apartment at 3222 23rd St. at around 9:30 a.m., according to the Chronicle. In total, five units were damaged — at least three buildings on Capp Street and one adjacent building on 23rd Street. More than 20 people were displaced by the fire, said Kathleen Maclay of the Red Cross.

Firefighters were dispatched to a two-alarm fire that was later upgraded to three alarms.

“It was a tough fire, getting in there and fighting aggressively in all five buildings,” Gonzales said.

Some 150 firefighters were called to prevent the fire from spreading, as the property lines are made of wood, Gonzales said. At least four of the buildings were built in 1900, according to property records.

“I am surprised they contained it when they did,” Gonzales said. “All units on scene did a good job.”

Ursula Newenhouse, who lives in the 763-765 Capp Street building, was awakened by her neighbors upstairs.

“I woke up to the neighbors yelling fire, fire!” she said. “I didn’t even grab my purse, I just grabbed my dog.”

Her upstairs neighbor, Hussain, said he woke up and saw fire coming out of his back porch and into the kitchen. As he spoke with reporters, Hussain stood at the perimeter of the fire scene, wearing no shoes. His three roommates, who stood nearby, appeared shaken by the experience.

Newenhouse’s yellow labrador, Lola, kept trying to get back inside the building. Seeing Newenhouse struggle, Madonna Gevargas, a neighbor from across the street, gave her a leash to restrain her dog.

“That’s the least I could do,” Gevargas said.