If 10 Corso Como sounds like an address, it is. It also happens to be one of Milan's most fasionable addresses, home to a number of attractions and shops.
10 Corso Como (it's Dieci Corso Como in Italian, as "dieci" is the word for 10) was originally an art gallery and bookstore, opened in a traditional Milanese building 1990 by Carla Sozzani. The complex grew over the years to include a cafe, a fashion boutique, a roof garden, and even a tiny hotel (with only three rooms) - all at the same address.
The courtyard cafe at 10 Corso Como is particularly popular for aperitivo, and getting a table can be incredibly difficult. You can enjoy the "see and be seen" atmosphere simply by browsing the shops, however.
Corso Como is north of the historic city center in Milan, just to the south of the Garibaldi train station. The gallery and shops are open daily from 10:30am-7:30pm (extended hours Wednesday and Thursday from 10:30am-9pm), and the restaurant and cafe are open daily from 11am-1am.