His heir Corrado (†1822) lived in the house, followed by his daughter Dorotea (†1853), who married Corrado Interlandi di Caltagirone, Prince of Bellaprima. In 1843 Dorotea Sirugo Interlandi allowed the municipality to set up a Theatre with a stage, curtain and scenery in the house’s large store-room, for the performances held in July to celebrate the festival of Saint Venera.

The building, known as u palazzu râ principissa (the house of the princess) was inherited by Pompeo Interlandi (Caltagirone 1811-Avola 1866). A friend of the botanist Giuseppe Bianca, Pompeo wrote in 1837 Osservazioni geognostiche e geologiche sopra i terreni di Avola (Geognostic and Geological Observations on the Lands of Avola). In 1848 he became a member of the Sicilian Parliament and at his own expense restored the Church of St. Anthony of Padua that adjoined the house. He left no heirs, and his assets and titles were inherited by the descendants of Anna Maria Sirugo, his mother’s sister, married in Ispica of the Baron Pietro Modica. In 1902 the Palace was acquired by the Alessi family and when Giambattista became owner he renovated it in the neo-classical style. The 1912 fine interior wall decorations with Art Nouveau allegorical figures and floral motifs are the work of painter Alessandro Abate (Catania 1867-1953).