Rialto · Zoning · O-P
Rialto O-P zoning: height, setbacks and lot size
In Rialto's O-P zone, buildings can be up to 35 ft tall and the front setback is 25 ft (Rialto code, read October 2026).
Key points
- Maximum building height: 35 ft
- Minimum front setback: 25 ft
- Minimum side setback: 5 ft
- Minimum rear setback: 5 ft (none where adjacent to an alley)
O-P (O-P OFFICE PARK ZONE) is a zoning district in Rialto. Every value below was read from the Rialto 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 O-P
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 | 35 ft § 18.27.030 · code textA. Building height limit, two and one-half stories and not to exceed thirty-five feet. |
|---|---|
| Minimum front setback | 25 ft § 18.27.030 · code textB. Front yard and street side yard, twenty-five feet; which shall be fully landscaped. |
| Minimum side setback | 5 ft § 18.27.030 · code textC. Interior side yard, five feet; which shall be fully landscaped. |
| Minimum rear setback | 5 ft Applies: none where adjacent to an alley § 18.27.030 · code textD. Rear yard, five feet; except where adjacent to an alley, then none. |
When a different number applies
The code sets other values for particular lots, buildings or locations in O-P:
- Minimum rear setback: None required — where adjacent to an alley § 18.27.030
Not on this page
We did not find a general stories, lot size, lot coverage, FAR, density limit for O-P in the zoning tables we read. The code may still set one elsewhere — check the Rialto Municipal Code.
Other Rialto zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Rialto's O-P zone?
35 ft — Rialto Municipal Code § 18.27.030.
What is the minimum front setback in Rialto's O-P zone?
25 ft — Rialto Municipal Code § 18.27.030.
What is the minimum side setback in Rialto's O-P zone?
5 ft — Rialto Municipal Code § 18.27.030.
What is the minimum rear setback in Rialto's O-P zone?
5 ft (none where adjacent to an alley) — Rialto Municipal Code § 18.27.030.
General information, not legal advice.
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