What is the biggest law firm in the bay area? How many lawyers work for them?

Hi I am a college student in need of everyones cooperation. For my critical thinking class we are doing some research on how we can come up with individual answers to complex questions. I was given the question “What is the biggest law firm in the bay area?” The bay area must include these six counties Alameda, San Mateo, San Francisco, Marin, Contra Costa, and Santa Clara. This question also asks how many lawyers work for that particular law firm and what is the starting salary and the highest salary as well. I am having problems defining “biggest” since it can be the law firm with the most lawyers, with the biggest building, or with the most locations. Please if you know the answer to any of these questions even if it is in just one county. Thank you.