Plaster keys are seen penetrating a steel mesh lathe as part of the ceiling over the Garden Court at the Palace Hotel in San Francisco, Calif., on Tuesday, August 15, 2017. The Palace Hotel is refurbishing the classic glass and old ceiling at the famous

Plaster keys are seen penetrating a steel mesh lathe as part of the ceiling over the Garden Court at the Palace Hotel in San Francisco, Calif., on Tuesday, August 15, 2017. The Palace Hotel is refurbishing the classic glass and old ceiling at the famous 118 yr old Garden Court. The structure was retrofitted after severe damage during the 1989 earthquake. (Photo By Carlos Avila Gonzalez/The San Francisco Chronicle via Getty Images)