The huge and continually rising cost of that decision has spurred national debate about federal subsidies for mortgage lending. Republicans want to sever ties with Fannie and Freddie once the crisis abates. The Obama administration and Congressional Democrats have insisted on postponing the argument until after the midterm elections.

Image A foreclosed home in Casa Grande, Ariz., has been refurbished, inside and out. It is listed by Mr. Bridwell’s agency. Credit... Joshua Lott for The New York Times

In the meantime, Fannie and Freddie are editing the results of the housing boom at public expense, removing owners who cannot afford their homes, reselling the houses at much lower prices and financing mortgage loans for the new owners.

The two companies together accounted for 17 percent of real estate sales in Arizona during the first four months of the year, almost three times their share of the market during the same period last year, according to an analysis by MDA DataQuick.

Valarie Ross, who lives in the Phoenix suburb of Avondale, has watched six of the nine homes visible from her lawn chair emptied by moving trucks during the last year. Four have been resold by the government. “One by one,” she said. “Just amazing.”

The population of Pinal County, where Mr. Bridwell lives and works, roughly doubled to 340,000 over the last decade. Developers built an entirely new city called Maricopa on land assembled from farmers. Buyers camped outside new developments, waiting to purchase homes. One builder laid out a 300-lot subdivision at the end of a three-mile dirt road and still managed to sell 30 of the homes.

Mr. Bridwell sold plenty of those houses during the boom, then cut workers as prices crashed. Now his firm, Golden Touch Realty, again employs as many people as at the height of the boom, all working exclusively for Fannie Mae. The payroll now includes a locksmith to secure foreclosed homes and two clerks devoted to federal paperwork.

Golden Touch gets more listings from Fannie Mae than any other firm in Pinal County. Mr. Bridwell said he was ready to jump because he remembered the last time the government ended up owning thousands of Arizona houses, after the late-1980s collapse of the savings and loan industry.