Sign Up Successful!
You now have access to more from Realmo!
Property Lookup
    Property Lookup
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    AI Search
    Back to Search
    The Largest CRE Database in the US with Over 1 Million Listings
    Property profile & analytics

    501 Islington St Ste, Unit 2 Portsmouth, NH 03801-4288

    • Office Properties & Spaces
    • 2,881 SF
    OFF-MARKET
    Last Sale
    Oct 02, 2023
    $6,925,000
    Value Estimations
    $5,930,000
    Show details
    Cap Rate Potential
    Location Intelligence
    Property ID
    US58-0530074
    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 Properties & Spaces

    Property Details for 501 Islington St Ste

    Year built
    1986
    Construction
    STEEL FRAME
    Property size
    2,881 SF
    Zone code
    CD4-L2
    Property type
    Office Properties & Spaces
    APN
    PRSM M:0157 B:0006 L:2
    APU
    PRSMM0157B0006L2

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

      Method
      Estimation
      Statistic approach
      $4,940,000
      ML approach
      $4,920,000

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

    Location Insight

    • Map
    • Local Demand
    City
    Portsmouth
    County
    Rockingham
    State
    New Hampshire
    Longitude
    -70.7691
    Latitude
    43.0721
    CBSA code
    14460
    CBSA name
    BOSTON-CAMBRIDGE-QUINCY, MA-NH 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
    2023
    $7,739
    $0.00
    $479,800
    $479,800
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation by Request
      72,537 SF

      90 Arboretum Dr

      Office Properties & Spaces • 72,537 SF
      90 Arboretum Dr, Newington, NH 03801
      View Details
    • Value Estimation
      $2,380,000
      10,824 SF

      288 Lafayette Rd

      CONDOMINIUM OFFICES • 10,824 SF
      288 Lafayette Rd, Portsmouth, NH 03801-5431
      View Details
    • Value Estimation by Request
      471 SF

      118 Maplewood Ave, Unit B3

      CONDOMINIUM OFFICES • 471 SF
      118 Maplewood Ave, Portsmouth, NH 03801-3787
      View Details
    • Value Estimation
      $8,135,000
      28,091 SF

      85 Nh Ave

      CONDOMINIUM OFFICES • 28,091 SF
      85 Nh Ave, Portsmouth, NH 03801-2820
      View Details
    • Value Estimation
      $6,095,000
      30,156 SF

      1000 Market St, Unit 1

      CONDOMINIUM OFFICES • 30,156 SF
      1000 Market St, Portsmouth, NH 03801-3358
      View Details
    • Value Estimation by Request
      448 SF

      10 Vaughan Mall Ste 203a

      CONDOMINIUM OFFICES • 448 SF
      10 Vaughan Mall Ste 203a, Portsmouth, NH 03801-4047
      View Details

    Similar Nearby for Sale

    • Contact for pricing

      Portsmouth Office Space for Lease

      Prime Portsmouth Office, Ample Parking
      875 Greenland Rd, Portsmouth, NH 03801
      View Details
    • Contact for pricing
      7,200 SF

      Historic Portsmouth Executive Offices

      7,200 SF, 3 Units, NNN Lease
      45 Pearl St, Portsmouth, NH 03801
      View Details
    • $300,000

      Portsmouth Office Condo - Prime Location

      Downtown Portsmouth office, renovated 2024.
      118 Maplewood Ave, Portsmouth, NH 03801
      View Details
    • Contact for pricing

      Portsmouth Office Space: North End Gem

      Class A Office, Vibrant Location, 2,325 RSF
      12 Portwalk Pl, Portsmouth, NH 03801
      View Details
    • $595,000
      0.11 Acres

      Prime Portsmouth Commercial Building For Sale

      Versatile 1,470 SF building in high-traffic Portsmouth location.
      1290 Woodbury Ave, Portsmouth, NH 03801
      View Details
    • $250,000

      Portsmouth Commercial Office Condominium

      Commercial office condominium in Portsmouth, renovated in 2024.
      118 Maplewood Ave, Portsmouth, NH 03801
      View Details

    Similar Nearby for Lease

    • $14 SF/Yr
      62,322 SF

      Portsmouth Office/Storage Space Available

      900 SF heated space, prime Portsmouth location.
      300 Constitution Ave, Portsmouth, NH 03801
      View Details
    • $18 SF/Yr
      38,745 SF

      Vaughan Mall Office Suites

      Portsmouth, NH Office Space Available
      10 Vaughan Mall, Portsmouth, NH 03801
      View Details
    • $28 SF/Yr
      47,745 SF

      Portsmouth Executive Office Space

      Prime Portsmouth Office, Flexible Suites Available
      100 Borthwick Ave, Portsmouth, NH 03801
      View Details
    • $12 SF/Yr
      26,512 SF

      Modern Office Space for Lease

      2,875 SF Office Suite in Rockingham County
      755 Banfield Rd, Portsmouth, NH 03801
      View Details
    • $22 SF/Yr
      72,537 SF

      Prime Newington Executive Office Space

      8,315 SF Office Suite Available Now
      90 Arboretum Dr, Newington, NH 03801
      View Details
    • $29 SF/Yr
      22,148 SF

      Downtown Portsmouth Office Suite

      1600 SF Office, Prime Location
      126 Daniel St, Portsmouth, NH 03801
      View Details
    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.
    501 Islington St Ste, Unit 2
    Portsmouth, NH 03801-4288
    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

    Google sign-in failed. Please try again or use another login method.