Kaine wants the Virginia General Assembly to approve the planned $4-billion Dulles Corridor Metrorail Project so that new office park and retail developments will follow a prescribed construction plan. Virginia road officials are working on a specific route for new developments along the Metrorail project and on nearby roads which the governor also wants upgraded, Kaine's office says. Their suggestions are expected over the summer.

Meanwhile, developers bide their time, awaiting the report. For example, McLean-based West Group plans to create a mini-city on 142 acres the company owns in Tysons Corner, West Group officials have previously announced.

Fairfax County officials are also waiting for new cost numbers on the Metrorail project, county staffers confirm. The county has to decide whether it would be cost-effective to submerge four miles of the project in an 80-foot deep tunnel under Tysons Corner. That realignment is supposed to diminish noise from an elevated rail line, according to sources familiar with the project.