There is a suspect, but he appears mentally ill and could have been paid by anyone to throw a molotov cocktail at the metal gate (to ensure that no one in the house got hurt):

https://sfstandard.com/2026/04/10/sam-altman-russian-hill-mo...

"Around 3:40 a.m., the suspect threw a bottle containing a flaming rag at the metal gate of 855 Chestnut St., according to a police report."