The most recent incident was caught on surveillance video at Prince Street Pizza.
Fire Marshals said Caleb Ganzer, 35, is seen setting the fire and walking away on July 13.
Ganzer is accused in two more fires, including one at Forsythia Restaurant on Stanton Street that caused $3,500 worth of damage.
"Initially, it was frustration and disappointment," said Jacob Siwak, owner of Forsythia Restaurant. "We're trying to have empathy for someone like him in this moment."
"It's not about the money, it's about the feeling. I spent three weeks building that. I did it myself," said Prince Street Pizza manager Tony Sosa.
"Food and Wine Magazine" named Ganzer "Sommelier of the Year" in 2017.
Ganzer is now on leave from the restaurant where he worked.
No one was hurt in the fires.
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