In May 2018, Metro announced an extensive renovation of platforms at twenty stations across the system, spanning all lines except the Silver Line. The Blue and Yellow Lines south of Ronald Reagan Washington National Airport station would be closed from May to September 2019, in what would be the longest line closure in Metro's history. Additional stations would be repaired between 2019 and 2021, but the corresponding lines would not be closed completely. The project would cost $300 to $400 million and would be Metro's first major project since its construction.