sentences:  The 12th-century tower was preserved, and a new residential block was constructed, its facade ornamented with pilasters and high windows with "lucarnes" and with triangular "frontons", which became a signature feature of the new style.The old medieval "chatelet", or gatehouse, was replaced by a new structure, the "Porte Dorée", which was composed of grand loggias one above the other, modeled after the palaces of Naples and Urbino.The second phase was new courtyard, the Cheval Blanc, with three long wings constructed of brick and "moellons et enduit", a mixture of rubble and cement, which became a common combination in French Renassiance architecture.