Prior to the renovation works on the first floor of the historic building, it is necessary to preserve the decoration of the Garden Galleries and the Lapidarium. Its condition, according to expert evaluation and research carried out, is unfortunately very poor, or even locally threatening its existence. Securing and preservation is required first of all by the polychrome stucco decorations with unstable construction elements, some of which have fallen away due to the corrosion of the handles. Also necessary is the preservation of frescoes by Michelangelo Palloni, a well-known Florentine artist. They are an example of top-notch art, and unfortunately, they have a significantly weakened structure of plaster and painted layers with varying levels of damage. Only immediate intervention can preserve these unique historical compositions. It is worth pointing out that the planned work in this area is the second state of the conservation work already started. Studies of the gallery decorations, carried out since 2005, have allowed researchers to obtain relevant information and construct a programme to protect them from further destruction, as well as a broader programme of restoration.