Located in between the first and second floors, these rooms are occupied by Renaissance and Medieval objects given in a bequest by Charles Loeser, an American expat collector and scholar. This collection is one of the most valuable municipal collections for its artistic and historical value. The rooms are located in the old palace, and were renovated in the mid-15th century by Michelozzo. It is the only part of the palace where the original 14th- and 15th-century ceilings are still entirely visible. Cosimo I's mother Maria Salviati lived in these rooms after Cosimo moved the family from Palazzo Medici to the Palazzo Vecchio (at that point Palazzo Ducale).