Construction is under way at the Evans Co.'s 230-acre Woodland Park, a large office complex about two miles east of Dulles International Airport.

Woodland Park is bordered by Centreville Road and Monroe Street and has nearly 5,000 feet of frontage along the Dulles Access Road. Development will be in four phases over 10 to 15 years. When completed, the complex will contain more than 6 million square feet of office space, as well as hotel, conference and recreational facilities.

"We're excited to be delivering an office park designed for the high-tech user, in a location and time which seems to coincide with the oncoming demand for just such a park," said Brian F. Tucker, the Evans Co.'s vice president for leasing. "The park offers the corporate exposure to the Dulles Access Road, with the security and flexibility of an individually designed campus."

Northridge, the first phase of the development, which began in late November, is being built on a 20-acre parcel and will consist of four six-story, 125,000-square-foot office buildings arranged in a cluster around brick plazas and landscaped courtyards. The buildings feature two-story atrium lobbies, nine-foot ceilings and "sleeving," to allow easy installation of communication lines between floors and to the roof. According to Tucker, this phase of the project, which was designed by the architectural firm of Davis and Carter, provides such tenants as government contractors and aerospace companies the potential for controlling one building, with the option of expanding to another to accommodate future growth.

Construction of phase two of the project, designed by the firm of Gordon and Greenburg, will begin this spring. It will feature the 250-suite Woodland Park Hotel and two eight-story, 180,000-square-foot office buildings. The complex will be located at the intersection of the Dulles Access Road and Centreville Road and will feature a bridge over a one-acre lake that will link the hotel, with conference facilities and health club, to the office buildings.

Woodland Park's third phase, scheduled to begin in the fall, calls for the construction of a 50,000-square-foot retail core at the center of the park, surrounding another lake. The complex will provide services for the park, including day care facilities, restaurants and travel services.

The park's fourth phase is expected to accommodate large corporate users who want large campus environments. Evans is currently developing a 12-acre site adjoining Phase II for the National Rural Utilities Cooperative's new national headquarters. Construction of the 300,000-square-foot building will begin in May.

To alleviate potential road congestion, Evans is widening Centreville Road and Monroe Street from two to six lanes.

In other developments in commercial realty:

The Food and Drug Administration has leased 40,067 square feet at 1901 Chapman Ave., Rockville from Equitable Life Assurance Society of the Unihted States. Barrueta & Associates was the leasing agent.

The Board of Supervisors for Fairfax County leased 21,000 square feet at 11242 Waples Mill Rd., Fairfax, from Georgelas & Sons. Studley was the leasing agent.