The San Francisco Chronicle put together a list of transportation projects happening in the Bay Area and when they are projected to be finished.
Among other things like the central subway in San Francisco, the Van Ness bus rapid transit, ferry expansion to Treasure Island and more, the road map states that the BART extension to Silicon Valley will likely be finished within the next 15 years. To be exact, the project is set to be completed in 2030.
According to the San Francisco Chronicle, "recent renderings by the VTA envision a downtown subway station where riders will descend more than 90 feet from street level to ride the trains."
See the full list of transportation projects, projected completion times and more here.