An extension of BART into Santa Clara county is under construction. The original plan for the San Jose extension included the Downtown San Jose station, but funding could not be secured and the San Jose extension was split into two phases. Phase one, planned for completion in 2018, is the Berryessa Extension into eastern San Jose. The proposed Downtown San Jose station is part of a later, unfunded phase two of the San Jose subway extension and would be located between the proposed Alum Rock and proposed Diridon/Arena BART stations. Construction is slated to begin in 2018, with a scheduled completion in 2025.