Union City MMU zoning: height, setbacks and lot size

MMU (Marketplace Mixed Use) is a zoning district in Union City. Every value below was read from the Union City Municipal Code and links to its section (read October 2026). State laws such as the ADU and SB 9 rules can allow more on a residential lot. General information, not legal advice — read the code text and check with the city before you build.

The general rule for a typical lot in this zone. Zoning tables often attach notes, such as rules for corner lots, lots next to a residential zone, or new subdivisions only. Open “code text” under a value to see the table cell or sentence it was read from.

Uses the code's use tables allow in MMU, or allow with a permit. Each links to its page with the code section.

• Child care center — Needs an administrative use permit (zoning administrator approval, chapter 18.54)

The code sets other values for particular lots, buildings or locations in MMU:

• Minimum front setback: 3 ft — Property lines located adjacent to private alley ways that provide access to private garages § 18.26.130
• Minimum front setback: 20 ft — Buildings with frontage on Decoto Road or Alvarado-Niles Road § 18.26.130
• Minimum front setback: 10 ft — Up to 10% of the building frontage on Decoto Road or Alvarado-Niles Road, subject to site development review § 18.26.130
• Minimum side setback: 3 ft — Property lines located adjacent to private alley ways that provide access to private garages § 18.26.130
• Minimum rear setback: 3 ft — Property lines located adjacent to private alley ways that provide access to private garages § 18.26.130

We did not find a general stories, lot size limit for MMU in the zoning tables we read. The code may still set one elsewhere — check the Union City Municipal Code.

• A
• CMU
• CPA
• CSMU
• MG
• ML
• MS
• R-5000
• SEMU-R
• VMU