According to this Washington Post article, General Services Administration (GSA), which is managing the search, is not considering Metro access a determining factor in deciding on a location. William Dowd, who oversees the FBI project for GSA, told the National Capital Planning Commission last week that his agency would not give greater consideration to a site close to a Metro station when determining where to put the FBI and what companies would build it.
The report also says the Greenbelt site — located on a Metro station parking lot, immediately next to the station — would rate equally as sites in Springfield, which is about a mile from Metro and Landover, which is two miles from a rail line.
The report also says, the GSA has begun planning to build thousands more parking spaces than originally envisioned, stoking concerns about the traffic that could result from the arrival of 11,000 FBI employees. Since beginning the process, the GSA increased the proposed number of spaces at two sites, Greenbelt and Springfield, reflecting new expectations from the agency that more FBI employees would drive to work than originally envisioned.