An Arlington, Virginia, parking garage connected with President Richard Nixon’s 1974 resignation is heading for redevelopment under a plan approved Saturday by the Arlington County Board. “Mark Felt, second in command at the FBI, met Washington Post reporter Bob Woodward here in this parking garage to discuss the Watergate scandal,” says a historical marker at the garage at 1401 Key Blvd. in Rosslyn. “Felt provided Woodward information that expo…