Fairfax County has approved construction of an eight-story office building in the Fairfax Center area in exchange for major road improvements called for in the county's transportation plan.

The Fairfax County Board of Supervisors approved the application by Fair Oaks Limited Partnership to develop a five-acre site near the intersection of Route 50 and Waples Mill Road where a hotel originally was to have been built.

The action was one of many recent rezonings in the Fairfax Center area near the Route 50 and Interstate 66 interchange -- one of the county's most rapidly changing sections.

The partnership has yet to announce a construction schedule for the office building, which will be 100 feet high and topped by a 20-foot-tall penthouse needed for equipment.

Developers will build a four-lane divided road as an extension of Waples Mill Road and a realigned four-lane Random Hills Road segment. In the long run, they expect that they will spend more on road improvements and rights of way for road construction than they would have been required to contribute to a county transportation fund. Fairfax Center area developers must make contributions to ensure that funds are available in the future for transportation changes needed as a result of growth. The county has said the partnership's road improvements will "more than fulfill" the requirement.

Fair Oaks Limited Partnership will construct "at its own expense, four lanes of the Waples Mill Road extension and four lanes of Random Hills Road," according to the staff report on the project. However, the company does not yet own all necessary rights of way and may seek to obtain them through the state's condemnation process.

The developers also will pay for construction of right and left turn lanes on Route 50.

In addition, the board of supervisors accepted the developers' proffer, or offer, to limit occupancy of the building until road improvements are made. According to papers filed by attorney Martin Walsh on behalf of the developers, the building will not be occupied until the Virginia Department of Highways and Transportation accepts the extended Random Hills and Waples Mill roads as state roads.

In 1981, Fairfax officials had approved construction of a hotel on the property by another development company, but the project was never started.