It is located in the central Piazza San Magno, next to the homonymous Basilica and was inaugurated on 28 November 1909,[1] during the city's period of greatest growth — industrial and demographic.

[2] The process that led to the design of Legnano's new town hall began in 1904, with the publication of the competition notice.

[3] In addition, rooms were planned that would have housed the porter's lodge, the telegraph office, the duty post and the savings bank.

[3] It was then built from 1908 to 1909 to a design by architect Aristide Malinverni with a total expenditure that turned out to be three times the budgeted.

The coats of arms — created in graffito by the Ghiringhelli brothers — of the 100 cities of Italy that have been depicted in the Council Chamber and the paintings — on the first floor — by Ettore Falchi and Ernesto Crespi are valuable from an artistic point of view.