Cost estimates for upgrading roads and public transit at Tysons Corner have jumped about 20 percent in just the past two years, and it is still not clear who is going to pay for it.

Fairfax County officials now expect Tysons streets and buses to cost $2.1 billion through 2030, up from the previous estimate of $1.6 billion. And costs through 2050 will reach $3 billion — or $5.5 billion in 2051 dollars, county staff estimated.

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