[3] The building became the noble summer residence of the archbishop Leone da Perego, thanks to whom it experienced a period of splendour that lasted until the end of the 15th century.

In correspondence with Palazzo Visconti, even after the demolition of the castello dei Cotta, the "porta di sotto", urban gate built in the Middle Ages and demolished in 1818,[6] continued to be present.

This covered passageway, with the demolition of the Cotta castle, began to connect the architectural complex formed by Palazzo Leone da Perego and Palazzo Visconti, to a building on the other side of today's Corso Magenta, which at the time was called Via Porta di Sotto.

[7][8] In 1898 Palazzo Leone da Perego was demolished and rebuilt using some decorations from the previous complex of the same name.

Media related to Palazzo Leone da Perego (Legnano) at Wikimedia Commons