sentences:  The main building was built in 1453 and in an unprecedent manner, two square pavilions were added between 1453 and 1461, anticipating the classical architecture by several decades.Jean III de Chambes built or transformed the grand stairway tower in the Italian style in 1510–1515, its carvings are similar to the ones of the gate-house of Chateau de Gaillon.In 1491, before the Italian campaign, Charles VIII had begun rebuilding the Château d'Amboise, turning it from a medieval castle into a more comfortable residence, with two wings and a chapel.