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    100 Borthwick Ave Portsmouth, NH 03801

    Sponsored
    For Lease
    $28 SF/Yr

    Prime Portsmouth Office, Flexible Suites Available

    Lot size:
    47,745 SF

    Description

    Added:
    Dec 11, 2024
    Days on Market:
    391
    This exceptional two-story office building, located at 100 Borthwick Avenue in Portsmouth, New Hampshire, offers 47,745 square feet of premium executive office space. Currently, 42,827 square feet is available for lease, with flexible suite sizes ranging from a minimum of 1,748 square feet to a maximum contiguous space of 13,027 square feet. The building, constructed in 1978, sits on an expansive 8-acre lot and is zoned OR - Office Research, providing ample opportunity for a variety of businesses. The property boasts ample parking for tenants and employees, along with convenient elevator access for ease of movement between the two floors. The building is ideally situated in Portsmouth, NH, with the address being 100 Borthwick Ave, zip code 03801. This location offers excellent accessibility and visibility within Rockingham County. Multiple tenancy options are available, making this property suitable for businesses of various sizes and needs. Interested parties should inquire about the available spaces and lease terms. This is a rare opportunity to secure high-quality office space in a desirable Portsmouth location.

    Property Features for 100 Borthwick Ave

    General Information

    Property type
    Office Properties & Spaces
    Lease Type
    Gross Lease
    RSF (Rentable sq. ft)
    47,745 SF
    Total Rate
    111405

    Building Details

    Year Built
    1978
    Stories
    2

    Unit(s) available at that property

    Space
    Second Floor Suite 320
    Size
    4,968 SF
    Rate per SF
    $28
    Space
    Second Floor Suite 330
    Size
    1,748 SF
    Rate per SF
    $28
    Space
    Lower Level Suite 110
    Size
    10,735 SF
    Rate per SF
    $28
    Space
    Second Floor Suite 310
    Size
    5,865 SF
    Rate per SF
    $28
    Space
    First Floor Suite 230
    Size
    6,484 SF
    Rate per SF
    $28
    Space
    First Floor Suite 210
    Size
    13,027 SF
    Rate per SF
    $28

    HighLights

    • 47,745 SF two‑story office building with 42,827 SF available for lease; suites from 1,748 SF to 13,027 SF contiguous.
    • Flexible suite layouts featuring private offices, open space, conference rooms, and kitchenettes.
    • Ample on‑site parking.
    • High visibility and signage opportunities on Borthwick Ave, near Portsmouth Regional Hospital, Liberty Mutual, and Highliner Foods.
    • Excellent location off US Route 1 and I‑95 Exit 3; within one hour of Manchester, NH; Portland, ME; and Boston, MA.
    • Built in phases: 1978, 1984, and 2005.
    Property Profile Location Intelligence

    Current Use by Public Records

    Money Management International ... Bankruptcy Service

    Suggested Use

    Realty agency Law Firm Building Supply Spa & Massage Dental Office Wholesale Shop Auto Repair Shop Hair Salon Nail Salon Hotel & Motel

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

    Location Insight

    • Map
    • Local Demand
    City
    Portsmouth
    County
    Rockingham
    State
    New Hampshire
    Longitude
    -70.7948231
    Latitude
    43.0595944

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    FAQs

    What type of property is this?
    Office Property / Space - Prime Portsmouth Office, Flexible Suites Available
    Where is this office property / space located?
    The property is located at 100 Borthwick Ave Portsmouth, NH.
    What is the lease rate?
    The lease rate is $28 SF/Yr.
    What are key features of this property?
    This property features: 47,745 SF two-story office building with 42,827 SF available for lease; suites from 1,748 SF to 13,027 SF contiguous.; Flexible suite layouts featuring private offices, open space, conference rooms, and kitchenettes.; Ample on-site parking.
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    Portsmouth, NH 03801
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    Realmo Value Estimation

    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

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    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.

    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
    100 Borthwick Ave Portsmouth, NH 03801
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