All districts
UDC Sec. 4.6.3 permits accessory dwelling units (ADUs) in two forms. Attached ADUs are allowed if the owner of the principal structure resides there, the ADU is architecturally integrated (maintaining the principal structure's building setbacks), and its floor area does not exceed half of the principal structure's first-floor gross living area. Detached ADUs require the same owner-occupancy condition, must generally sit behind the rear facade of the principal structure (subject to the accessory-building setback encroachments in Sec. 4.2.4.D), need a minimum 10 ft building separation from the principal structure (unless connected by a breezeway or similar rooflink, or an alternative fire-protection measure is approved), cannot have a separate water or wastewater meter or be subdivided from the principal lot, and are capped at half of the principal structure's first-floor gross living area. In non-residential districts (except GI) one ADU is permitted only in support of the non-residential use's operation (custodial, security, management, or similar) and must be at least 600 sq ft, located in the same building as the primary use. Confirm the district and current Sec. 4.6.3 text with the Planning Department before acting.