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    Property profile & analytics

    28 Deer St Portsmouth, NH 03801-7704

    • Office buildings
    • 22,765 SF
    • 0.25 lot acres
    OFF-MARKET
    Value Estimations
    $6,590,000
    Show details
    Cap Rate Potential
    Location Intelligence
    Property ID
    US58-0541353
    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

    • NAI Norwood Group / Real Estate Agency
    • The Groomsmith / Barber Shop
    • National Electrical Manufacturers Representatives Association / Association Or Organization
    • Jones Trading Institutional / Financial Advisor

    Property Details for 28 Deer St

    Year built
    1999
    Construction
    STEEL FRAME
    Lot size
    0.25 lot acres
    Property size
    22,765 SF
    Zone code
    CD4
    Property type
    Office buildings
    APN
    PRSM M:0118 B:0014 L:
    APU
    PRSMM0118B0014L

    Description

    This Class A, 22,765 square foot office building, constructed in 2000, offers executive suites in a prime Portsmouth, NH location. The building features one four-story structure with elevators, and currently has 5,829 square feet of vacant space available. Units range from a minimum of 1,766 square feet to a maximum contiguous space of 4,063 square feet, perfect for multiple tenants. The building boasts an architect-designed, high-end finish, combining private offices with open work areas, along with convenient amenities such as a conference room and kitchenette. Enjoy stunning Piscataqua River views from this prestigious location on Deer Street, situated in the heart of Portsmouth's vibrant downtown. On-site parking is available. The property is zoned CBD, B and its proximity to numerous hotels (Sheraton, Marriott Residence Inn, Hilton Garden Inn, Hampton Inn and Suites) and the Harbor Events Center provides unparalleled convenience and accessibility. The Rockingham County address is 28 Deer St, Portsmouth, NH 03801 (APN: 0118-0014-0000). A virtual tour is available online.

    Value Estimations

    based on Realmo’s proprietary methodology

    • CAP approach

      CAP Return
      Estimation
      6%
      $6,950,000
      6.5%
      $6,415,000
      7%
      $5,955,000

    • Comparable approach

      Method
      Estimation
      Statistic Estimate
      $8,334,000
      Market price range: $4.02M - $11.4M
      AI Estimate
      $5,020,000
      Market price range: $1.98M - $6.35M

    • Alternative Use

      Use
      Estimation
      OFFICE BUILDING
      $6,960,000
      Current use
      COMMERCIAL (GENERAL)
      $10,260,000
      Change: +47% Conversion: Easy
      RESTAURANT
      $10,210,000
      Change: +47% Conversion: Moderate
      AUTO REPAIR, GARAGE
      $6,000,000
      Change: -14% Conversion: Difficult

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

    Location Insight

    • Map
    • Local Demand
    City
    Portsmouth
    County
    Rockingham
    State
    New Hampshire
    Longitude
    -70.7594
    Latitude
    43.0793
    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
    $71,685
    $1,048,200
    $3,396,000
    $4,444,200
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $4,680,000
      18,858 SF

      180 Greenleaf Ave

      OFFICE BUILDING • 18,858 SF
      180 Greenleaf Ave, Portsmouth, NH 03801-5322
      View Details
    • Value Estimation
      $1,245,000
      4,757 SF

      206 Market St

      OFFICE BUILDING • 4,757 SF
      206 Market St, Portsmouth, NH 03801-3730
      View Details
    • Value Estimation
      $28,840,000
      110,250 SF

      1 Nh Ave

      OFFICE BUILDING • 110,250 SF
      1 Nh Ave, Portsmouth, NH 03801-2904
      View Details
    • Value Estimation
      $5,190,000
      22,248 SF

      755 Banfield Rd

      OFFICE BUILDING • 22,248 SF
      755 Banfield Rd, Portsmouth, NH 03801-5647
      View Details
    • Value Estimation
      $5,090,000
      34,991 SF

      195 Commerce Way

      OFFICE BUILDING • 34,991 SF
      195 Commerce Way, Portsmouth, NH 03801-3243
      View Details
    • Value Estimation
      $8,440,000
      38,986 SF

      155 Commerce Way

      OFFICE BUILDING • 38,986 SF
      155 Commerce Way, Portsmouth, NH 03801-3243
      View Details

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    Similar Nearby for Lease

    • Contact for pricing
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      Four-story office building sublease available through 2034.
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      View Details
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      1,000 SF

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      Portsmouth Office/Storage Space Available

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      High-End Office Space Available

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      View Details
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    28 Deer St
    Portsmouth, NH 03801-7704
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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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