Occupancy
- retail (M), office (B), restaurant (A-2, or B if under 50 occupants)
- each has its own rules
Mixed-use buildings put a business under homes. That triggers separations, accessibility, utilities and zoning that a pure residential building never sees.
The storefront brings public visitors, a different occupancy and its own utilities.

The rest of Ground-floor commercial: 1 more spread, 5 drawings and 5 code citations, plus every other chapter, is part of the full fieldbook.
One payment, lifetime access. Kitchen, Bathroom and Stairs are free to read.