concepts to serve the region, ultimately choosing to build a downtown transit tunnel that would be convertible from buses to light rail at a later date. The PSCOG formally endorsed a light rail plan in 1986, recommending a system be built by 2020, and include a line between Seattle and Sea-Tac Airport, with routing alternatives that served the Rainier Valley. A 1988 advisory measure on light rail planning was passed in King County, encouraging Metro Transit to accelerate the plan's timeline to open by 2000. In 1990, the state legislature endorsed the creation of a regional transit board composed of politicians from King, Pierce, and Snohomish counties, with the goal of implementing the regional transit plan. Several members of the Seattle City Council endorsed the rail plan on the condition that it pass through the Rainier Valley, by then an economically disadvantaged and majority-minority neighborhood. The Central Puget Sound Regional Transit Authority, later renamed Sound Transit, was created in 1993 to write and present a regional transit plan for voter approval. The agency proposed a light rail network as the centerpiece of a $6.7 billion transit ballot measure, with a surface line through the Rainier Valley and tunnels between Downtown Seattle, Capitol Hill, and the University District. The ballot measure failed to pass on March 14, 1995, and the light rail line was shortened to , between the University District and Sea-Tac Airport. Voters approved the $3.9 billion package on November 5, 1996, along with increases to sales taxes and motor vehicle excise taxes across the regional transit district. Sound Transit considered several routing options during a series of public hearings and studies early into the project's environmental impact study, which adopted the name "Central Link". In 1999, Sound Transit selected the alignment for the light rail project, consisting of a line between the University District and Sea-Tac Airport, with surface segments passing through Tukwila, the Rainier Valley, and SoDo, and tunnels under Beacon Hill, First Hill, Capitol Hill, and Portage Bay. Budget issues and delays The Central Link project was originally planned to open in 2006 and projected to cost $1.9 billion (equivalent to $ in dollars), but the estimates were found to be unrealistic by auditors in November 2000. New executives, hired by Sound Transit to replace previous program directors, presented a revised plan with an opening date pushed back three years to 2009 and a $3.8 billion