The yearslong project to overhaul the U.S. central bank’s headquarters in Washington, D.C., has run into multiple hurdles, including higher-than-expected groundwater at the site.

A sprawling $2.5 billion project to renovate the central bank’s headquarters in Washington has become the focal point of attacks from the Trump administration.

President Donald Trump and Federal Reserve Chairman Jerome Powell sparred face to face Thursday over the cost of renovations of the central bank’s Washington headquarters, with the Fed leader saying the president was wrong about the cost of the overhaul.