Seismic retrofit project for a tender of a Courthouse in L’Aquila, heavily damaged by the 2009 earthquake. The building structure is a R.C. frame of overall dimension in plan of 65x75m, which has one level underground and two stories above ground. The project foresaw mainly the demolition and the rebuilding of the second floor, too much damaged to be recovered, and throughout the building, base isolation devices have been installed by cutting all the columns at parking level.