The Transbay Transit Center/Caltrain Downtown Extension (TTC/DTX) project is the critical centerpiece of a long-range visionary transportation plan that will transform downtown San Francisco and regional transportation well into this century. The project consists of three interconnected elements: 1) replacing the outmoded terminal with a modern terminal; 2) extending Caltrain 1.3 miles from Fourth and King streets to the new TTC at First and Mission streets, with accommodations for future high-speed rail; and 3) creating a new transit-friendly neighborhood with 3,000 new homes (35 percent of which will be affordable) and mixed-use commercial development. The total program budget is currently estimated at $4.1 billion in year-of-expenditure dollars. In May 2010 the Transbay Joint Powers Authority (TJPA) Board adopted a $1.6 billion budget for Phase 1 (TTC, pedestrian ramps, and the train box, which is the subterranean portion of the TTC building that will house the Caltrain and high-speed rail station). The current estimate for Phase 2 (DTX) is $2.5 billion.
The Prop K Expenditure Plan includes $270 million (in 2003 dollars) for the project. Of this amount, $237.7 million is designated as Priority 1 and $32.3 million as Priority 2 funds. The Expenditure Plan specifies that the downtown rail extension and the terminal, known as the Transit Center Building, are to be built as a single integrated project. To date, the Authority has allocated $147 million in Prop K funds to the project.
Design work continues on Construction Documents for the Transit Center Building. Pelli, Clarke, Pelli Architects is proceeding with the implementation of the Risk and Vulnerability Assessment review recommendations. Completion of the 100% design is now scheduled for May 2013 to allow for those changes to occur. With Preliminary Engineering complete for the DTX, Parsons Transportation Group continued coordination with Caltrain and the California High-Speed Rail Authority (CHSRA).
The $187 million contact with Balfour Beatty for the construction of the buttress, excavation, and shoring of the new TTC building, is over 50% complete. In October 2012, TJPA awarded a $122 million contract to Shimmick Construction for the construction of the below-grade structure and work has commenced on the installation of micropiles and mud slab. It will be followed by contracts for Superstructure, Glazing, and in December 2013, main construction package Construction of the TTC is expected to be complete in late 2016. Bus operations are scheduled to commence in August 2017. Meanwhile, bus operations continue at the new temporary terminal.
The DTX is scheduled for completion in 2019; however, work is on hold due to a funding gap.
FACT SHEET
Download the most recent Transbay Transit Center fact sheet.
Project Schedule
| TIMEFRAME |  |
ACTIVITY
|
|---|---|---|
| April 2009 | Transit Center Final Design begins | |
| August 2010 | Operations begin at Temporary Terminal | |
| August 2010 | Demolition of old terminal begins | |
| December 2010 | Shoring Wall and Buttress construction begins | |
| February 2013 | Sub-surface construction begins | |
| April 2014 | Superstructure construction begins | |
| April 2015 | Exterior Enclosure construction begins | |
| April 2015 | Interior Finishes begin | |
| October 2017 | Bus Operations begin |
- Visit the Transbay Transit Center Web site and take an interactive tour.
- See the California High-Speed Rail Authority Web site and take a quick CGI tour of the system on YouTube.