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    Property profile & analytics

    21660 Copley Dr Diamond Bar, CA 91765

    • Office buildings
    • 50,745 SF
    • 4.33 lot acres
    For Lease
    View listing
    $2 SF/Yr
    Value Estimations
    $530,000
    Cap Rate Potential
    Location Intelligence
    Property ID
    US09-7580726
    The Realmo ID is a unique identifier assigned to every property, incorporating country codes and precise geo-coordinates for 300x300-foot land blocks. It enables standardized data collection and seamless integration of disparate sources such as ownership, tax, title data and physical specifications. By aggregating current and historical records, the Realmo ID powers advanced analytics and delivers deep, verifiable insights for real estate professionals.

    Current Use by Public Records

    • Office buildings

    Property Details for 21660 Copley Dr

    Year built
    1988
    Construction
    TILT-UP CONCRETE
    Lot size
    4.33 lot acres
    Property size
    50,745 SF
    Zone code
    LCR110000*
    Property type
    Office buildings
    APN
    8293-050-019
    APU
    8293050019

    Description

    Gateway Corporate Center, located at 21660 & 21700 Copley Dr, Diamond Bar, CA 91765, presents a significant retail opportunity in Los Angeles County. This Class B property, built in 1988, offers a total of 16,619 square feet across three stories, situated on a substantial 255-acre lot. The property is currently multi-tenant, with 12,417 square feet of vacant space immediately available for lease. Flexible space options cater to various business needs, ranging from a minimum divisible unit of 593 square feet to a maximum contiguous space of 8,423 square feet. Ample parking is provided with a 4:1000 ratio. The property's location in Diamond Bar offers excellent access and visibility, making it an ideal location for a variety of retail businesses. This is a rare opportunity to secure prime retail space in a thriving Los Angeles County market. The property's size and flexibility make it suitable for a range of retail concepts, from smaller boutiques to larger-scale operations. Interested parties are encouraged to inquire about lease terms and availability. The property is categorized as Commercial Retail.

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

      Method
      Estimation
      ML approach
      $530,000

    Get a detailed, property-specific valuation — fast and free

    Location Insight

    • Map
    • Local Demand
    City
    Diamond Bar
    County
    Los Angeles
    State
    California
    Longitude
    -117.834
    Latitude
    33.9976
    CBSA code
    31080
    CBSA name
    LOS ANGELES-LONG BEACH-ANAHEIM, CA METROPOLITAN STATISTICAL AREA

    Property Tax & Assessments

    Tax date
    Tax Amount
    Assessed Land Value
    Assessed Improvement Value
    Total Assessed Value
    Applied Tax Rate
    Land Market Value
    Improvement Market Value
    Total Market Value
    2024
    $156,434
    $4,018,945
    $7,914,828
    $11,933,773
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

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      $730,000
      26,098 SF

      21671 Gtwy Ctr Dr

      OFFICE BUILDING • 26,098 SF
      21671 Gtwy Ctr Dr, Diamond Bar, CA 91765-2461
      View Details
    • Value Estimation
      $630,000
      68,715 SF

      20955 Pathfinder Rd

      OFFICE BUILDING (MULTI-STORY) • 68,715 SF
      20955 Pathfinder Rd, Diamond Bar, CA 91765-4028
      View Details
    • Value Estimation
      $315,000
      7,000 SF

      1310 Vly Vis Dr

      OFFICE BUILDING • 7,000 SF
      1310 Vly Vis Dr, Diamond Bar, CA 91765-3910
      View Details
    • Value Estimation
      $905,000
      36,788 SF

      22632 Golden Spgs Dr

      OFFICE BUILDING • 36,788 SF
      22632 Golden Spgs Dr, Diamond Bar, CA 91765-4166
      View Details
    • Value Estimation
      $370,000
      3,650 SF

      21316 Pathfinder Rd

      OFFICE BUILDING • 3,650 SF
      21316 Pathfinder Rd, Diamond Bar, CA 91765-2700
      View Details
    • Value Estimation
      $555,000
      19,840 SF

      1315 Vly Vis Dr

      OFFICE BUILDING • 19,840 SF
      1315 Vly Vis Dr, Diamond Bar, CA 91765-3928
      View Details

    Similar Nearby for Sale

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      Diamond Bar Corporate Center Office

      Office spaces for sale in Diamond Bar Corporate Center.
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      8 SF

      Diamond Bar Commercial Opportunity

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    Similar Nearby for Lease

    • Contact for pricing

      Fully Leased Diamond Bar Office

      Office building in Diamond Bar, CA, currently 100% leased.
      732 N Diamond Bar Blvd, Diamond Bar, CA 91765
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      Fully Leased Office Building

      Office building in Diamond Bar, CA, currently 100% leased.
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      View Details
    • $33 SF/Yr
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      Diamond Bar Executive Office Space

      Prime Office Suite, 1,078 SF Available
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      View Details
    • $900 /Mo
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      Freeway-Visible Diamond Bar Office Space

      Professional office building with flexible lease terms and various amenities.
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    • $28 SF/Yr
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      Prime Diamond Bar Office Space

      Class A Office Suites Available Now
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      View Details
    • $1.50 SF/Yr
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      Diamond Bar Retail/Office Suite

      Retail or office suite available for lease in Diamond Bar.
      514-518 N Diamond Bar Blvd, Diamond Bar, CA 91765
      View Details
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    Diamond Bar, CA 91765
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    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
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