The façade dates from an 1871 restoration by Carlo Maciachini, who kept the marble portal with tympanum, a gallery of small arches, the rose window and three statues of saints attributed to Giovanni di Balduccio or the Master of Viboldone.
In the lunette is a mosaic representing the Madonna between Saints, a copy of the original by Angelo Inganni.

The campanile dates from the 14th century.
It was restored and completed in 1885.
The interior, in the Baroque style, has a nave and two aisles.

In the first chapel on the right are frescoes by Gian Paolo Lomazzo.
In the right transept is a fresco by the Fiammenghini with Alexander IV Instituting the Order of the Augustinians, under which a 14th-century Crucifixion was discovered in 1956.
The author of the latter has been identified by Anovelo da Imbonate.
The right arms of the transept houses also several sarcophagi from the mid-14th century, including the tomb of Lanfranco Settalo, counsellor of Archbishop Giovanni Visconti, by Giovanni di Balduccio.

Near the rear exit is a 16th-century tombstone portraying the Angel of the Resurrection, another fresco by the Fiammenghini (under which is a 14th-century fresco).
On the side walls of the presbytery are frescoes depicting Dispute of St Ambrose and St Augustine by Camillo Procaccini and the Baptism of St. Augustine by Giovanni Battista Crespi.
The façade dates from an 1871 restoration by Carlo Maciachini, who kept the marble portal with tympanum, a gallery of small arches, the rose window and three statues of saints attributed to Giovanni di Balduccio or the Master of Viboldone. In the lunette is a mosaic representing the Madonna between Saints, a copy of the original by Angelo Inganni.
The campanile dates from the 14th century. It was restored and completed in 1885. The interior, in the Baroque style, has a nave and two aisles.
In the first chapel on the right are frescoes by Gian Paolo Lomazzo. In the right transept is a fresco by the Fiammenghini with Alexander IV Instituting the Order of the Augustinians, under which a 14th-century Crucifixion was discovered in 1956. The author of the latter has been identified by Anovelo da Imbonate. The right arms of the transept houses also several sarcophagi from the mid-14th century, including the tomb of Lanfranco Settalo, counsellor of Archbishop Giovanni Visconti, by Giovanni di Balduccio.
Near the rear exit is a 16th-century tombstone portraying the Angel of the Resurrection, another fresco by the Fiammenghini (under which is a 14th-century fresco). On the side walls of the presbytery are frescoes depicting Dispute of St Ambrose and St Augustine by Camillo Procaccini and the Baptism of St. Augustine by Giovanni Battista Crespi.
San Marco, Milan