[tyre]

It's possible but has it's own challenges. If the benefit of moving to Oakland is lower costs, than that has to be made up for partially by lower salaries (most of a startup's costs are in people.)

Being near BART is fine, but not if your employees are coming from SF. Then they still need to pay SF salaries to make up for cost of living.

Living in Oakland can be less compelling due to the housing stock. Oakland has many single family homes, which I personally feel is a good thing, but less compelling for many workers.

(We can, of course, debate whether the kinds of workers who aren't in the life-stage to want/need a single family home are the right kinds of workers to go after, but that's a separate conversation.)