sentences:  Michelozzo had already designed the Medici's town palazzo in Florence, the Palazzo Medici-Riccardi, and Cosimo's new villa at Careggi.The architect transformed the forbidding fortress into a castellated country house - in effect, the castle became a villa.After the death of Cosimo de' Medici in 1464, the villa became a hunting lodge of his son Piero.