Highlights
- The average rent for office space in Diamond Bar is $35.41 per square foot, 3.25% higher compared to the previous year.
- The market’s vacancy rate stands at 12.75%, lower than the state average of California, which is 18.44%.
2025 Office Space Rent & Sales
- $35.41 2025 Avg. Asking Rent
- 3.25% Y-o-Y Avg. Asking Rent Change
- 12.75% 2025 Office Vacancy Rate
What is the average asking rent price for office space in Diamond Bar?
Average asking rents for office space here stand at $35.41 per square foot. The local office market recorded an average vacancy rate of 12.75% in 2025, unchanged from 12.75% in 2024.
Diamond Bar, CA Office Asking Rents by Class
What is the average office rent per square foot by property class in CA?
- Avg. Asking Rent Class A & A+$58.81
- Avg. Asking Rent Class B$37.82
- Avg. Asking Rent Class C$22.26
For comparison, the average rent for Class A and A+ office space in California was $58.81 per square foot. The state-wide average for Class B space was $37.82 per square foot, and Class C office spaces averaged $22.26 per square foot.
Diamond Bar, CA Office Indicators by Submarket
| Submarket | Asking Rents | Vacancy Rates |
|---|---|---|
| San Gabriel Valley | $33.78 | 15.64% |
| Gateway Cities | $32.60 | 3.19% |
What are the largest recent office completions in Diamond Bar?
The largest recent office completion here is 1370 Valley Vista Drive at 85,536 square feet, completed in 1988. The next largest completions are Gateway Corporate Center and Plaza Diamond Bar.
| Office building | Address | SF | Completed |
|---|---|---|---|
| Gateway Corporate Center | 21680 Gateway Center Dr., 91765 | 84,900 | 1999 |
| St. Jude Medical Center | 1514 Valley Vista Dr., 91765 | 20,972 | 1998 |
| 1370 Valley Vista Drive | 1370 Valley Vista Drive, 91765 | 85,536 | 1988 |
| Gateway Corporate Center | 21660 E. Copley Dr., 91765 | 50,131 | 1988 |
| 556 N Diamond Bar Blvd | 556 N Diamond Bar Blvd, 91765 | 46,000 | 1988 |
| 1540 Bridgegate Drive | 1540 Bridgegate Drive, 91765 | 51,840 | 1987 |
| Sunset Plaza Professional Building | 556 N Diamond Bar Blvd, 91765 | 47,680 | 1987 |
| Plaza Diamond Bar | 20955 Pathfinder Rd., 91765 | 64,433 | 1982 |
| 22632 Golden Springs Dr | 22632 Golden Springs Dr, 91765 | 54,292 | 1980 |
| Sunset Plaza | 560-588 N Diamond Bar Blvd, 91765 | 8,999 | 1968 |
See reports for other markets
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Disclaimer
All information on this page is based on city-level data that includes properties equal to or larger than 25,000 square feet.
Averages were calculated based on values dated between January 1st and December 31st 2025. Construction pipeline data represented herein is valid as of January 2026.
While every effort was made to ensure the accuracy of the data presented in this report, the information is provided “as is” and neither CommercialCafe nor Yardi Research Data can guarantee that the information provided is complete.