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Class A office spaces are available for lease on the 2nd floor. Suite 1 is an open concept 550± SF single room office. Suite 200 is 11,062± SF consisting of 3 conference rooms, 9 offices, kitchen/break room, IT room, and a large open cube area. Modern designer furniture is included in the lease rate (Suite 200 only). Suites feature high ceilings, lots of windows, and elevator access. Other tenants include X5 Home Loans, Global Laminates, TopMark Funding, Concord Electric, Asian Atlantic Industries, and NERACOOS. Located 3.5± miles to downtown Portsmouth, 2.6± miles to I-95, and 0.6± miles to Route 1.

Full Property Details for 300 Constitution Ave #1

General

  • Status: Active
  • Type: Commercial Lease
  • Source: PrimeMLS
  • MLS ID: 5113240
  • Updated: Today (10/7/2026)
  • Added to Site: Today

Location

  • County: Rockingham

Utilities

  • Sewer: Public

Structural Information

  • Roof: Flat
  • Square Feet: 62,322
  • Finished Total: 550 Sq. Ft.
  • Year Built: 2013

Lot Features

  • Lot Size (Acres): 5.55
  • Lot Size (Sq. Ft.): 241,758
  • Frontage Feet: 160
  • Zoning: Industrial

Listed by Colliers International, Andrew Ward

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Listed by Colliers International, Andrew Ward

Listing agent

— 300 Constitution Ave #1 —

  • Andrew Ward

    Colliers International

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Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 300 Constitution Ave #1

School District:Portsmouth School District, Portsmouth, NH
NameGradesDistance
Mary C. Dondero Elementary School
32 Van Buren Avenue, Portsmouth, NH 03801
K-51.2 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Estimate the Cost for 300 Constitution Ave #1

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Be ready to buy your new home!

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NMLS#: 1598647

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Listed by Colliers International, Andrew Ward

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300 Constitution Avenue #1, Portsmouth, NH 03801 (MLS# 5113240) is a Commercial Lease property. 300 Constitution Avenue #1 is currently listed for and was received on October 07, 2026. Want to learn more about 300 Constitution Avenue #1? Do you have questions about finding other Commercial Lease real estate for sale in Portsmouth? You can browse all Portsmouth real estate or contact a Coldwell Banker agent to request more information.

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