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    660 N Diamond Bar Blvd Suite 128 Diamond Bar, CA 91765

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    For Sale
    $778,000

    Move-in ready, renovated office condo with freeway access and ample parking.

    Added:
    Nov 26, 2025
    Days on Market:
    129
    Last Refresh:
    Dec 15 at 9:09 pm

    Property Features for 660 N Diamond Bar Blvd Suite 128

    General Information

    Standard status
    Active

    Building Details

    Year Built
    1982

    We can help!

    Listing Contact
    Willy Sybert
    Willy Sybert

    Listing agent Willy Sybert License #3239764

    Listing office LPT REALTY, LLC

    Listing date Nov 26, 2025

    Source Lee-associates

    Displayed information is deemed reliable but is not guaranteed and should be independently verified.

    All listing content including descriptions, pricing, images are the copyrighted material of LPT REALTY, LLC

    Overview

    Renovated Office Condo in Diamond Bar

    This 1,977 square-foot office condo in Diamond Bar is move-in ready. The suite features two large rooms with a tea/coffee bar and three offices. Renovated in 2015, the space includes high-end solid maple doors and upgraded sound insulation in the walls. It is suitable for a smaller company looking to own their own space. The property offers convenient first-floor access, security cameras, common area bathrooms, and a spacious lobby. An attentive management company oversees the building, which is occupied by friendly tenants and owners. The building was built in 1982 and substantially renovated between 2014 and 2015. The property provides desirable access to the 60 and 57 freeways and visibility. Ample parking and handicap access are available. The suite has both front and back entrances. The property is conveniently located between Sunset Crossing and Temple Boulevard.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Office Units

    Suggested Use

    Restaurant Real Estate Agency Law Firm Building Supply Spa & Massage Center Dental Office Big Box & Wholesale Store Auto Repair Shop Hair Salon Nail Salon

    Zoning and permitted uses should be independently verified with local authorities.

    Location Insight

    • Map
    • Local Demand
    City
    Diamond Bar
    County
    Los Angeles
    State
    California
    Longitude
    -117.8084494
    Latitude
    34.0317894

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    FAQs

    What type of property is this?
    Office units - Move-in ready, renovated office condo with freeway access and ample parking.
    Where is this office units located?
    The property is located at 660 N Diamond Bar Blvd Suite 128 Diamond Bar, CA.
    What is the asking price?
    The asking price for this property is $778,000.
    What are key features of this property?
    This property features: Move‑in ready, fully‑renovated 1,977 SF office condo.; Convenient 1st floor access with front and back entrances.; Desirable 60/57 freeway access and visibility.
    (877) 366-2213
    We can help!
    Listing Contact
    Willy Sybert
    Willy Sybert
    Real Estate License ID: 3239764
    Learn More
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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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