Hi i wanted to share with you about colocation in the bay area. there are many colo sites in the san francisco bay area and i have to say the most impressive site i have been to is the AT&T Redwood City Internet Data Center. They have world class enterprise service. if you are looking for collocation in the san francisco bay area, you will not find a better collocation than at AT&T. They have multiple Internet Data Centers in the bay area and you can choose where you want to do you web hosting. This is top of the line colocation services. If you are considering collocation service by a Internet Service Provide (ISP) i recommend you give them a visit and try their service or ask for a tour, you will be very impress by the professionalism, after all, its AT&T the world's network company. They have the fastest network in the planet, and that's important when you want enterprise class service. I was able to find their number on their site, call AT&T:

800-248-3632