ROCHESTER, N.Y. — Rochester firefighters battled flames overnight on Friday at two buildings, a seven-story vacant building on St. Paul Street and an apartment complex on Mount Hope Avenue.

RFD says they rescued a dog from the fire at The Hamilton apartment complex near the Genesee River. Crews responded to the fire around 12:20 a.m. after getting reports of smoke in the hallway. They found a fire on the ninth floor, quickly put out the flames, and rescued the dog.

No people were found inside the apartment. The Red Cross is helping the residents of the apartment that caught fire.

Before that fire, around 11:30 p.m., firefighters got reports of flames at the Cox Building, the vacant and heavily boarded-up building next to the RTS Transit Center. It took about 75 firefighters just over an hour to control the fire.

Because of the size of the building, three alarms were called. Rochester Fire Chief Stefano Napolitano said the building’s size presented a challenge.

“It’s a seven story building, multiple rooms, open pipe chase ways, multiple conduits for fire to travel,” Napolitano said. “Firefighters just encounter multiple challenges. You know, you don’t know if there’s any squatters in there. So you’re going in and you’re giving it your best effort.”

No firefighters were injured in either fire and the causes are still under investigation.