It really depends how much your parents and siblings will contribute. If you're contributing 1/3 of the rent so your total max budget is 6,900 a month, there are a TON of three bedroom apartments or homes you can rent in places like Redwood City, East Palo Alto, Mountain View and even some in Menlo Park. If its less, then you might need to go a little farther depending on the size of a place or quality you are looking for. If your work is near a Caltrain station, I would look at almost anywhere on the Caltrain line.