The second largest church in the city rebuilt in Baroque style. The origins of the church date back to the 13th century.
Mozart used to live in the adjacent monastery for a short while. It's worth a quick visit if you're in the area and have some time to spare.
Wikipedia https://en.wikipedia.org/wiki/San_Marco,_Milan
Address Piazza San Marco, 2, 20121 Milan, Italy
Coordinates 45°28'23.958" N 9°11'19.994" E