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    375 E 21st Costa Mesa, CA 92627

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    Claim this Listing
    For Sale
    Under Contract
    $2,250,000

    Triplex - Costa Mesa, CA

    Type:Triplex
    Property size:
    2,693 SF
    Lot size:
    8,276.00 Acres
    Price / SF:
    $835/SF
    Added:
    Mar 20, 2026
    Days on Market:
    42
    Last Refresh:
    Apr 30 at 12:06 pm

    Property Features for 375 E 21st

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Triplex
    Bedrooms
    6
    Bathrooms
    4
    Rooms
    Bathroom 1, Bathroom 2, Bathroom 3, Bathroom 4, Bedroom 1, Bedroom 2, Bedroom 3, Bedroom 4, Bedroom 5, Kitchen, Living Room
    Parking
    4
    Parking features
    Garage
    Exterior features
    Community Features Included: Curbs, Biking, Street Lights, Lot 6500-9999, Park Nearby, Front Yard, Back Yard, Lawn
    Appliances
    Cooktop, Cooktop - Gas, Dishwasher, Microwave, Washer
    Standard status
    Active Under Contract
    APN
    42623225
    Size
    2,693 SF
    Lot size
    8,276.00 Acres

    Utilities

    Heating system
    Central, Wall Furnace
    Cooling system
    None (Cooling)

    Building Details

    Year built
    1972
    Floors in Building
    2
    Number of units
    3
    Flooring type
    Carpet, Laminate, Tile
    Roof type
    Composition
    Architectural style
    Other

    We can help!

    Listing Contact
    Bernice Devries
    Bernice Devries

    Listing agent Bernice Devries License #01276952

    Listing office Kastell Real Estate Group 1048 Irvine Ave No. 453, CA

    Listing date Mar 20, 2026

    MLS# NP26060927 Listing URL

    Copyright © 2026 California Regional Multiple Listing Service, Inc. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    Overview

    Eastside Costa Mesa Triplex Opportunity

    Located in Eastside Costa Mesa, this triplex property offers three separate legal living units totaling 2,693 square feet on an 8,276 square foot lot. The front house is a single-level unit with 2 bedrooms, 1 bath, a single-car garage, and private laundry. Behind it, there is a two-story end unit featuring 2 bedrooms, 1.5 baths, and its own detached garage. Above the three garages is a carriage unit with 2 bedrooms and 1 bath. The rear homes share a laundry area. The property is located near the Newport Beach border, close to schools, shops, restaurants on 17th Street, and beaches. This property may suit investors seeking income or owner-occupants desiring flexibility and rental income.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Triplexes

    Suggested Use

    Real Estate Agency Law Firm Restaurant Spa & Massage Center Dental Office Hair Salon Nail Salon Building Supply Daycare Center Gym & Fitness Center

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

    Location Insight

    • Map
    • Local Demand
    City
    Costa Mesa
    County
    Orange
    State
    California
    Longitude
    -117.9020817
    Latitude
    33.6424016

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    FAQs

    What type of property is this?
    Triplex - Triplex in Eastside Costa Mesa with three separate living units.
    Where is this triplex located?
    The property is located at 375 E 21st Costa Mesa, CA.
    What is the asking price?
    The asking price for this property is $2,250,000.
    What are key features of this property?
    This property features: Rare Eastside Costa Mesa property with three separate legal living units totaling 2,693 sq ft on a large 8,276 sq ft lot.; Prime location near the Newport Beach border, award‑winning schools, 17th Street shops/restaurants, and beaches.; Three distinct units: a 2 bed/1 bath front house with garage and laundry, a 2 bed/1.5 bath two‑story end unit with detached garage, and a 2 bed/1 bath carriage unit above the garages.
    (714) 488-9381
    We can help!
    Listing Contact
    Bernice Devries
    Bernice Devries
    Real Estate License ID: 01276952
    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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