The complex was expanded by Nicolò Duodo (1657–1742), the grandson of Francesco Duodo. His expansion included the secondary wing designed by Tirali, which was completed in 1740. This wing, at right angles to the principal wing, is of a far simpler design, also on two floors; it has small rectangular windows relieved by a Serlian window at the centre. This wing is connected to the church by a low closed corridor. The chapel has a low dome crowned by a cupola and a campanile also completed by a cupola. The entrance to the church is through a three-arched portico. The pediment of the portico is in reality a gable to the roof of the church.