One of Mansouri's triumphs was the overseeing of the reconstruction and renovation of the opera house following the October 1989 earthquake. After closing at the end of the 1995 Fall season for "a 21-month, US$88.5 million renovation, San Francisco's War Memorial Opera House reopened on 5 September 1997 with a gala concert celebrating this occasion, as well the 75th anniversary of the San Francisco Opera. Fittingly, the concert featured operatic greats of the past, present and future. The project included repairs of damage caused by the 1989 Loma Prieta earthquake, improvements for the audience and performers, seismic strengthening and a general cleanup that left the 65-year-old Opera House gleaming."