Secretary Mellon's building commission actively sought the demolition of the Old Post Office to fulfill that plan, but preservation efforts—which continued over the course of 50 years—saved the Old Post Office. The second half of the grand plaza was never finished as designed, save for a curve in the northwest corner of the headquarters of the Internal Revenue Service. (The nearby Ronald Reagan Building, completed in 1998, does mirror, to some degree, the semicircle of the west façade of the Clinton Building.)