Some market technicians have transferred from New York and others were hired at the office housed in the Chicago Fed, according to several people familiar with the build-out that began about two years ago, after Hurricane Sandy struck Manhattan.

Officials believe the Chicago staffers can now handle all of the market operations that are done daily out of the New York Fed, which is the U.S. central bank's main conduit to Wall Street.

The satellite office in the Midwest readies the New York Fed for perhaps the most delicate U.S. interest-rate hike ever. With rates having been near zero for more than six years, and markets flooded with reserves, the Fed will rely on an array of new tools to help it tighten policy, likely later this year.