Italy uses a cadastral system to categorize properties based on their intended use. Here's a brief overview of common property categories in Italy:
A1: Residential property (primary residence)
A2: Residential property (secondary residence)
A3: Residential property (holiday home)
A4: Agricultural property
C1: Commercial property (warehouses, industrial buildings)
C2: Commercial property (retail, service businesses)
C3: Commercial property (hotels, restaurants)
C4: Commercial property (offices)
The only property categories that are legal for residential housing are the A1-3 categories. You can't legally live in a space categorized as a commercial property.