Add Listing
    For Sale
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    Highway 100 Commercial Business Opportunity Title is generated by Realmo AI

    321 Highway 100, Port Isabel, TX 78578

    View on Map
    Claim this Listing
    For Sale
    $1,500,000

    Retail,Other - Port Isabel, TX

    Property size:
    2,384 SF
    Price / SF:
    $629/SF
    Added:
    Jan 1, 2026
    Days on Market:
    136
    Last Refresh:
    May 17 at 6:06 pm

    Property Features for 321 Highway 100

    General Information

    Property type
    Commercial Sale
    Property subtype
    Other
    Zoning
    Comm
    Standard status
    Active
    Size
    2,384 SF

    Taxes and HOA fees

    Tax Year
    2023
    Tax Annual Amount
    6257.29

    Building Details

    Year built
    1982
    Number of units
    2
    Architectural style
    Other

    We can help!

    Listing Contact
    Laura Stathopoulos
    Laura Stathopoulos

    Listing agent Laura Stathopoulos

    Listing office Blue Heron Realty & Management, LLC 222 N Expressway Suite 185, Brownsville, TX

    Listing date Jan 1, 2026

    MLS# 103941 Listing URL

    Copyright © 2026 South Padre Island Board of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • Two established businesses (liquor store and convenience store) included in the sale.
    • Prime commercial location on Highway 100 in Port Isabel.
    • Includes building, equipment, inventory, and business.
    • Drive‑through window for liquor store convenience.
    • Well‑established business with 40+ years of family operation.
    • High visibility and accessibility with shared black top parking lot.

    Overview

    The sale includes the building, equipment, inventory, and business of Causey's Liquor and Circle Drive Inn, encompassing two businesses and the parking lot. This commercial business is situated on Highway 100 in Port Isabel, offering visibility and accessibility. The property features 1,224 square feet for the convenience store and 1,160 square feet for the liquor store, sharing a black top parking lot. The liquor store includes a drive-through window. The sign over Circle Drive Inn is a local landmark, used for daily celebrations and announcements. The family has operated the business for over 40 years. This is a chance to own a turnkey, family business in Port Isabel on the way to South Padre Island. The property is zoned for commercial use.
    Location Intelligence

    Current Use by Public Records

    Grocery and convenience stores

    Suggested Use

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

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

    Location Insight

    • Map
    • Local Demand
    City
    Port Isabel
    County
    Cameron
    State
    Texas
    Longitude
    -97.3389
    Latitude
    26.0776

    Nearby Similar for Sale

    • $799,999
      1,794 SF

      Waterfront Triplex Investment Opportunity

      Furnished waterfront triplex near South Padre Island with boat slips.
      1109 Tarpon Ave, Port Isabel, TX 78578
      View Details
    • $499,900
      2,645 SF

      Port Isabel 5-Plex Investment

      Fully occupied 5-plex near South Padre Island beaches.
      510 Musina, Port Isabel, TX 78578
      View Details

    FAQs

    What type of property is this?
    Grocery and convenience store - Turnkey business on Highway 100 in Port Isabel for sale.
    Where is this grocery and convenience store located?
    The property is located at 321 Highway 100 Port Isabel, TX.
    What is the asking price?
    The asking price for this property is $1,500,000.
    What are key features of this property?
    This property features: Two established businesses (liquor store and convenience store) included in the sale.; Prime commercial location on Highway 100 in Port Isabel.; Includes building, equipment, inventory, and business.
    (956) 299-5945
    We can help!
    Listing Contact
    Laura Stathopoulos
    Laura Stathopoulos
    Learn More
    Request Owner's contact information
    Message sent successfully
    Error
    If you are the owner or broker of this property and would like to edit or remove this listing please send a message to web site administrator.
    Message sent successfully
    Error
    Email to Your Friends
    Link copied to clipboard
    Separate multiple addresses with a comma
    Message sent successfully
    Error

    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
    Thanks! Your message was sent.
    Error! Your message wasn't sent.
    Please enter your name
    Please enter email
    Please enter the email in the correct format
    Please enter phone
    Please enter the number in the correct format
    Please enter message
    Thank You

    You are Unsubscribed From Notifications

    Thank You for Inquiry
    321 Highway 100, Port Isabel, TX 78578
    letter with green check mark
    Check your email
    We sent you the
    agent's contact details. yellow underline
    Can't find it?
    Please check your junk/spam folder.
    Google sign-in failed. Please try again or use another login method.
    Sign Up Successful!
    You now have access to more from Realmo!