| Primary address | 21700 Copley Drive, Diamond Bar |
| Zip code | 91765 |
| County | Los Angeles |
| Municipality | Diamond Bar |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Current property tax | $257,830 |
| Building sqft | 85,000 |
| Building class | Office Building - 2 to 5 Stories (1703) |
| Acreage | 6.893
|
| Year built | 1990 |
| Year last altered | 1991 |
| Stories | 2 |
| Zoning district | Register |
| Weed hazard | No |
| School district | Walnut Valley Unified School District |
View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab. For more property insights, including its Energy Star score, its Existing Buildings Energy and Water Efficiency Program (EBEWE) status, and additional energy and water usage data, create an account.
Property reports include comprehensive occupancy, improvement and development information (where available).
Create a free account to access valuable data points such as:
This Office Building - 2 to 5 Stories (1703) located at Gateway Corporate Center - 21700 Copley Drive, Diamond Bar, CA 91765 has a total of 85,000 square feet.
What is the year built & the current market value of Gateway Corporate Center - 21700 Copley Drive, Diamond Bar, CA 91765?Gateway Corporate Center - 21700 Copley Drive, Diamond Bar, CA 91765 was built in 1990 and has a current tax assessor's market value of $20,412,779.
View detailed property contacts like owners, building management, representatives from permits and tenants with a free account.
| Listing type | For Lease |
|---|---|
| Listing date | 09/23/2019 |
| Last updated | 05/24/2026 |
A three-story, 51,000 square foot building accentuated by a rose tile and glass exterior located in Diamond Bar at 21660 East Copley Drive in the Gateway Corporate Office Park.
| Suite name | Space type | Lease rate | Available space | Brokers |
|---|---|---|---|---|
| Suite 250 | General Office | $39/Sqft/Year | 3,469 | Sean Kern Ryan Russell |
| Suite 175 | General Office | $39/Sqft/Year | 1,631 | Sean Kern Ryan Russell |
| Suite 190 | General Office | $39/Sqft/Year | 1,871 | Sean Kern Ryan Russell |
| Suite 210 | General Office | $39/Sqft/Year | 1,662 | Sean Kern Ryan Russell |
Create a free account to view the complete sales history for 21700 Copley Drive, Diamond Bar, including title documents, transfer conditions, mortgages and liens.
To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.
R: Recorded date
D: Document date
Access detailed property tax data for Gateway Corporate Center - Gateway Corporate Center - 21700 Copley Drive, Diamond Bar, CA 91765. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year: | 2025-2026 |
| Base tax | $239,054 |
| Current property tax | $257,830 |
| Market value | $20,412,779 |
Abatements, financial assistance programs and non-ad valorem taxes levied as special taxes/direct assessments are applicable for this property.
| Code | Description | Tax levied |
|---|---|---|
| 06221 | County Sanitation District #21 | Register |
| 14651 | Diamond Bar District #38 | Register |
| 02824 | Diamond Bar Lighting District | Register |
| 06181 | Greater L.A. County Vector Control District | Register |
| 03694 | La County Regional Park And Open Space District | Register |
Here's the assessment & property tax history for 21700 Copley Drive, Diamond Bar, including the evolution of the total tax rate and corresponding property tax.
| Year | Assessment value | Total tax rate | Property tax | Year over year change |
|---|---|---|---|---|
| 2025-2026 | $20,412,779 | 1.1711 | $239,054 | +3.43% |
| 2024-2025 | $20,012,529 | 1.1549 | $231,125 | +2.57% |
| 2023-2024 | $19,620,127 | 1.1485 | $225,337 | +2.10% |
| 2022-2023 | $19,235,420 | 1.1474 | $220,707 | +1.75% |
| 2021-2022 | $18,858,256 | 1.1502 | $216,908 | +1.32% |
The complete history of permits filed for 21700 Copley Drive, Diamond Bar, including new construction or demolition permits, complaints, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.
Access a detailed real estate market overview of Diamond Bar so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Diamond Bar and compare it to other neighborhoods in Los Angeles County.
Check out recently sold homes in Diamond-Bar and see how their prices compare.
| Total population | 44,502 |
| Median age | 46 |
| Average household income | $139,295 |
| Family households | 78.8% |
| Occupied housing units | 15,233 |
| Owner occupied units | 77.5% |
| Average number of people per household | 2.91 |
| Median year structure built | 1980 |
| Median value for units with a mortgage | $925,900 |
| Median value for units without a mortgage | $898,800 |
Create a free account to unlock extended information for 21700 Copley Drive, Diamond Bar, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
| Fire hazard zone | See more on map |
| Faults and tsunami inundation zone map | Register |
| Landslides and liquefaction map | Register |
Access the detailed traffic volume map for 21700 Copley Drive, Diamond Bar to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
Here are the neighbors for Gateway Corporate Center - 21700 Copley Drive, Diamond Bar.