Diamond Bar · Zoning · OB
Diamond Bar OB zoning: height, setbacks and lot size
In Diamond Bar's OB zone, generally buildings can be up to 6 to 8 stories, the front setback is 30 ft and the minimum lot size is 6,000 sq. ft., with the conditions listed below (Diamond Bar code, read October 2026).
Key points
- Maximum number of stories: 6 to 8 stories
- Minimum front setback: 30 ft (Plus 10 ft for each additional story over 3)
- Minimum side setback: 20 ft
- Minimum rear setback: 30 ft
- Minimum lot size: 6,000 sq. ft. (Parcels proposed in new subdivisions; subject to the exception in section 22.08.050.)
OB is a zoning district in Diamond Bar. Every value below was read from the Diamond Bar 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 OB
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 number of stories | 6 to 8 stories See notes 3, 4 below the table in the code. § 22.10.040 · code textTable row “Height limit (3)”, column “OB (4)”: 6 to 8 stories Note 3: Maximum allowable height for structures. See section 22.16.060 (Height measurement and height limit exceptions). Note 4: Projects located within the Gateway Corporation Center are subject to any additional development standards contained with the Gateway Corporate Center Design Guidelines. |
|---|---|
| Minimum front setback | 30 ft Applies: Plus 10 ft for each additional story over 3 See note 4 below the table in the code. § 22.10.040 · code textTable row “Front”, column “OB (4)”: 30 ft.; plus 10 ft. for each additional story over 3. Note 4: Projects located within the Gateway Corporation Center are subject to any additional development standards contained with the Gateway Corporate Center Design Guidelines. |
| Minimum side setback | 20 ft See note 4 below the table in the code. § 22.10.040 · code textTable row “Sides (each)”, column “OB (4)”: 20 ft. Note 4: Projects located within the Gateway Corporation Center are subject to any additional development standards contained with the Gateway Corporate Center Design Guidelines. |
| Minimum rear setback | 30 ft See note 4 below the table in the code. § 22.10.040 · code textTable row “Rear”, column “OB (4)”: 30 ft. Note 4: Projects located within the Gateway Corporation Center are subject to any additional development standards contained with the Gateway Corporate Center Design Guidelines. |
| Minimum lot size | 6,000 sq. ft. Applies: Parcels proposed in new subdivisions; subject to the exception in section 22.08.050. See notes 1, 4 below the table in the code. § 22.10.040 · code textTable row “Minimum lot area (1)”, column “OB (4)”: 6,000 sq. ft. Note 1: Minimum area for parcels proposed in new subdivisions, except as otherwise provided by section 22.08.050 (Minimum lot area). Commercial condominium or planned development projects may be subdivided with smaller parcel sizes for ownership purposes, with the minimum lot area requirement determined through the subdivision review process, provided that the overall development site complies with the lo Note 4: Projects located within the Gateway Corporation Center are subject to any additional development standards contained with the Gateway Corporate Center Design Guidelines. |
Uses in OB
Uses the code's use tables allow in OB, or allow with a permit. Each links to its page with the code section.
- Child care center — Needs a conditional use permit
- Private school — Needs a conditional use permit
When a different number applies
The code sets other values for particular lots, buildings or locations in OB:
- Maximum floor area ratio (FAR): 1.00 — Range is 0.25 to 1.00; the review authority may allow a higher FAR within that range for amenities § 22.10.040
Not on this page
We did not find a general height, lot coverage, FAR, density limit for OB in the zoning tables we read. The code may still set one elsewhere — check the Diamond Bar Municipal Code.
Other Diamond Bar zoning districts
Who this affects
Frequently asked questions
What is the maximum number of stories in Diamond Bar's OB zone?
6 to 8 stories — Diamond Bar Municipal Code § 22.10.040.
What is the minimum front setback in Diamond Bar's OB zone?
30 ft (plus 10 ft for each additional story over 3) — Diamond Bar Municipal Code § 22.10.040.
What is the minimum side setback in Diamond Bar's OB zone?
20 ft — Diamond Bar Municipal Code § 22.10.040.
What is the minimum rear setback in Diamond Bar's OB zone?
30 ft — Diamond Bar Municipal Code § 22.10.040.
What is the minimum lot size in Diamond Bar's OB zone?
6,000 sq. ft. (parcels proposed in new subdivisions; subject to the exception in section 22.08.050) — Diamond Bar Municipal Code § 22.10.040.
General information, not legal advice.
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