The Federal Housing Finance Agency said in December that it would wait until at least October before setting new “purchase limits” for Fannie Mae and Freddie Mac. The regulator of the two government-sponsored enterprises is considering establishing purchase limits below the statutory conforming loan limits. In the highest-cost markets, the biggest loan the GSEs could buy would be $600,000, instead of $625,500. The national purchase limit would be $400,000, roughly 4 percent below the $417,000 conforming ...