After holding the proposal hostage for almost a month as part of its feud with the Northern Virginia Builders Association, the Fairfax County Board of Supervisors this week approved rezoning 25 acres in the Falls Church-McLean area.

The board approved plans by two developers filed jointly to build two separate town-house projects on adjacent tracts at the Kirby Road and Great Falls Street intersection.

In addition, the board, at the request of Dranesville Supervisor Nancy Falck, asked the Department of Environmental Management "to expedite the review of processing of site plans and come back to the board as soon as possible."

"This has been deferred as we worked out our concerns about bonding," Falck said.

Even though the hostilities between the builders association and the board still exist, the board apparently decided it could no longer hold up proposals containing private roads. The board deferred this proposal in early February as a show of strength to demonstrate its opposition to vigorous lobbying by the builders group on behalf of statewide changes in bonding practices.

Filed by the Wills-Nikor Joint Venture and Robert A. Young and Associates, the application called for rezoning parcels known as the Davis and Houston tracts at the southeast corner of Great Falls and Kirby from one house per acre to five houses per acre.

A total of 129 town houses will be built on the sites. Young and Associates plan to put 32 on the Davis tract, which fronts on Kirby Road. NVHomes is planning to build 96 town houses on the Houston site, which was developed by the Wills-Nikor group, according to attorney Keith Martin.

"Construction is expected to start on both sites next fall," said Curt Bradley, Young's lawyer. But both Bradley and Martin said construction timetables are tied to approval of final site plans. Conceptual site plans were approved this week.

Old homes now sit on both sites. The Houston house will be torn down, but Young is trying to renovate and move the Davis house.

Bradley and Martin were caught off guard when they were told the application was being deferred in early February. It was held as a symbol of the county's opposition to the builders group's push for legislation that would have prevented Fairfax from forcing builders to post bonds guaranteeing construction of private roads. Bond modification legislation was approved by the General Assembly, but the bond bill was amended at the last minute to allow governments to continue forcing builders to bond private roads.

Both the projects in question will be served by private roads.