After winning approval of a $9 million industrial development bond from Fairfax County, Datatel Minicomputer Co. this week said it plans to build new corporate headquarters at Fair Lakes, a 620-acre mixed-use development in the western part of the county.

The project will be a joint venture of Datatel and the Hazel/Peterson Cos., developers of Fair Lakes. Datatel will move from its current Alexandria facilities when the new building is finished.

Datatel and Hazel/Peterson Cos. will use funds generated by the Fairfax County Economic Development Authority bond to build a four-story building at Fair Lakes, near the intersection of Rte. 50 and I-66. The Datatel building will be built on 16 acres adjacent to the corporate headquarters for Hazel/Peterson Cos., which is already under construction.

Construction will begin in midsummer, with completion planned for next fall, Datatel President Tom Davidson said. Davidson said Datatel will fill more than 100 jobs in the building.

Datatel provides a computer system for colleges and universities nationwide. A second Datatel division, situated in Indianapolis, markets a special computer system to county and city governments, Datatel officials said.

The new headquarters in Fairfax "will play a key role in facilitating Datatel's growth as an organization, the expansion of our higher-education markets and the development of new, related markets," Davidson said.

James W. Todd, president of Hazel/Peterson Cos., said the decision by Datatel to move to Fair Lakes is indicative of the caliber of corporate tenants moving to Fair Lakes and to Fairfax County.

Other organizations that have announced they will open facilities in Fair Lakes include Mohasco Corp., TRW Inc. and Blue Cross & Blue Shield of the National Capital Area.