San Marino · Zoning · III
San Marino III zoning: height, setbacks and lot size
In San Marino's III zone, buildings can be up to 30 ft tall, the front setback is 40 ft and the minimum lot size is 17,000 sq. ft. (San Marino code, read October 2026).
Key points
- Maximum building height: 30 ft
- Minimum front setback: 40 ft
- Minimum side setback: 12 ft
- Minimum rear setback: 40 ft
- Minimum lot size: 17,000 sq. ft.
- Maximum lot coverage: 30% of actual lot area (The smaller of this and 28% of the statutory lot area applies. Statutory lot area is the minimum building site.)
III (R-1 Area District III) is a zoning district in San Marino. Every value below was read from the San Marino 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.
Development standards in III
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.
| Maximum building height | 30 ft § 23.02.09 · code textTable row “III”, column “Maximum Building Height”: 30 ft. |
|---|---|
| Minimum front setback | 40 ft § 23.02.09 · code textTable row “III”, column “Minimum Required Yard Dimension”: Rear Side Front | 40 12 40 |
| Minimum side setback | 12 ft § 23.02.09 · code textTable row “III”, column “Minimum Required Yard Dimension”: Rear Side Front | 40 12 40 |
| Minimum rear setback | 40 ft § 23.02.09 · code textTable row “III”, column “Minimum Required Yard Dimension”: Rear Side Front | 40 12 40 |
| Minimum lot size | 17,000 sq. ft. § 23.02.09 · code textTable row “III”, column “Minimum Building Site (Statutory Parcel Area)”: 17,000 sq. ft. |
| Maximum lot coverage | 30% of actual lot area Applies: The smaller of this and 28% of the statutory lot area applies. Statutory lot area is the minimum building site. § 23.02.10 · code textTable row “III”, column “Percent Of Actual Lot Area”: 30 |
When a different number applies
The code sets other values for particular lots, buildings or locations in III:
- Maximum lot coverage: 28% of statutory lot area — The smaller area governs, together with the actual-area limit. Statutory lot area is the minimum building site. § 23.02.10
Not on this page
We did not find a general stories, FAR, density limit for III in the zoning tables we read. The code may still set one elsewhere — check the San Marino Municipal Code.
Other San Marino zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in San Marino's III zone?
30 ft — San Marino Municipal Code § 23.02.09.
What is the minimum front setback in San Marino's III zone?
40 ft — San Marino Municipal Code § 23.02.09.
What is the minimum side setback in San Marino's III zone?
12 ft — San Marino Municipal Code § 23.02.09.
What is the minimum rear setback in San Marino's III zone?
40 ft — San Marino Municipal Code § 23.02.09.
What is the minimum lot size in San Marino's III zone?
17,000 sq. ft. — San Marino Municipal Code § 23.02.09.
General information, not legal advice.
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