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    321 5 Ave Portland, TX 78374

    Sponsored
    For Lease
    $2,450 /Mo ($18 SF/Yr)

    COMMERCIAL - Portland, TX

    Type:Office
    Property size:
    1,625 SF
    Lot size:
    0.79 Acres
    Days on Market:
    23
    Last Refresh:
    Jan 25 at 2:06 am

    Property Features for 321 5 Ave

    General Information

    Property type
    Commercial Lease
    Property subtype
    Office
    Standard status
    Active
    Rooms
    Bathroom 1
    Bathrooms
    1
    APN
    70456
    Parking
    8
    Parking features
    Off Street
    Patio and Porch features
    Porch, Patio
    Size
    1,625 SF
    Lot size
    0.79 Acres

    Utilities

    Heating system
    Central, Electric (Heating)
    Cooling system
    Central Air, Electric

    Building Details

    Year built
    2003
    Floors in Building
    1
    Flooring type
    Vinyl, Tile

    We can help!

    Listing Contact
    Brenton Reagan

    Cass Real Estate (361) 643-2662

    Listing agent Brenton Reagan (512) 736-2695 License #0669077

    Listing date Jan 3, 2026

    MLS# 462188

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

    Learn more

    Overview

    Portland Office Space For Lease

    This commercial property for lease, previously home to businesses such as a law firm and the main offices of an oil-and-gas company, is located across the street from Portland's city-acquired block in the heart of the new Leisure & Entertainment District (LED). The unit at 321 5th Avenue comprises approximately 1450 square feet of office space, including 4 individual offices, a reception/waiting area, 2 separate open areas, a kitchenette, and a restroom. The property is situated on a 0.79-acre lot. With the building and street parking completed this year, the location is in the middle of new activity and excitement. The lease is a gross lease except for electricity, with no assessments for NNN. Water, sewer, and trash services are included in the rent amount. No dumpsters are allowed on the property. The tenant is responsible for electricity for the unit and any other items such as internet, cable, or security systems, if desired. The property is located in Portland, TX, in San Patricio County.
    Location Intelligence

    Current Use by Public Records

    Office space

    Map

    City
    Portland
    County
    San Patricio
    State
    Texas
    Longitude
    -97.2907
    Latitude
    27.9445

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    FAQs

    What type of property is this?
    Office space - Commercial office space in Portland's Leisure & Entertainment District.
    Where is this office space located?
    The property is located at 321 5 Ave Portland, TX.
    What is the lease rate?
    The lease rate is $18 SF/Yr.
    What are key features of this property?
    This property features: - Prime location in the heart of Portland's new Leisure & Entertainment District (LED), across from the City-acquired block and community events.; - Versatile ~1450 SF office space with 4 individual offices, reception area, 2 open areas, kitchenette, and restroom.; - Gross lease (excluding electricity) with water/sewer/trash included in rent; no NNN assessments.
    (512) 736-2695
    Request Owner's contact information
    321 5 Ave Portland, TX 78374
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    Portland, TX 78374
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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
    321 5 Ave Portland, TX 78374
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    We can help!
    Listing Contact
    Brenton Reagan
    Real Estate License ID: 0669077
    (512) 736-2695
    Learn more
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