The Arlington County Board agreed yesterday to consider new redevelopment rules aimed at preventing developers from further reducing the county's dwindling supply of housing for low- and moderate-income residents.

The proposal would allow the board to set up "affordable housing redevelopment districts," in which developers and landowners could be required to provide an affordable home for each resident displaced by high-rises or other development.

Under the plan, developers could retain individual garden apartments -- which are the only low-cost units for thousands of Arlington residents -- or build replacement units for residents. The board scheduled a hearing on the proposal for November.

The board's move toward establishing such districts was brought on by developers' plans to raze Pollard Gardens, a 40-year-old complex that is overshadowed by high-rise condominiums and offices built along the Ballston-Virginia Square Metro corridor.

More than two dozen residents of the complex said the board's plan might not work in time to save Pollard Gardens and urged the board to take a more drastic action to preserve the 124-unit complex.

The residents asked the board to preemptively change Arlington's land-use plan to ban high-rise development on the site, which is bounded by North Fairfax Drive, Wilson Boulevard and North Pollard Street.

"Putting off {a change in the land-use plan} virtually guarantees the displacement of tenants and the demolition of our homes," said David Rathbun, president of Pollard Gardens' civic association.

Despite residents' pleas not to do so, board members, who historically have been reluctant to change the land-use plan, delayed consideration of such a change until November, when the public hearing on the new redevelopment rules is to be held.