501 Islington Street, Portsmouth, NH 03801

Listing agent Tim Braseth Show Phone

Listing office Colliers International

Listing date Nov 13, 2025

Source Harborlightrealty

Displayed information is deemed reliable but is not guaranteed and should be independently verified.

All listing content including descriptions, pricing, images are the copyrighted material of Colliers International

Report an issue

---

Overview

Two office suites are available for lease at 501 Islington Street in downtown Portsmouth on the recently improved Islington Street. Suite 1E is approximately 762 SF on the 1st floor and includes two private offices, a conference room, a reception area, and shared restrooms. Suite 3 spans approximately 8,644 SF on the 3rd floor and features five private offices, four conference rooms, a reception area, and an open cubicle area. Suite 3 also includes a secure data room, four restrooms, and a kitchen/breakroom.

The property is located in downtown Portsmouth within walking distance to downtown and the West End. It is also about 1.5 miles from I-95 and Route 16, supporting convenient access for employees and visitors. Monument and directory signage are available.

These suites can work well for professional service tenants seeking a mix of private offices and dedicated meeting space. Suite 1E suits smaller teams that need a reception area and conference room alongside two private offices, while Suite 3 is more suitable for larger office users that require multiple conference rooms, additional restroom capacity, and a secure data room. Tenant responsibilities include separately metered electric, while CAM includes water, sewer, heat, and air conditioning.

Suggested Use

Real Estate Agency Law Firm Restaurant Spa & Massage Center Dental Office Hair Salon Nail Salon Building Supply Daycare Center Gym & Fitness Center

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

Location Insight

• Map
• Local Demand

City

Portsmouth

County

Strafford

State

New Hampshire

Longitude

-70.769871

Latitude

43.071691

Nearby Similar for Lease

• 

  $3,700/Mo

  1,300 SF

  Second-Floor Office Suite

  Historic downtown office suite with private restroom and shared patio access, available immediately.

  96 Penhallow Street, Portsmouth, NH 03801

  View Details
• 

  $3,700/Mo

  1,300 SF

  Second-Floor Office Suite

  Historic downtown office with a private restroom, shared patio access, and exterior signage rights.

  96-98 Penhallow St, Portsmouth, NH 03801

  View Details
• 

  $15 SF/Yr

  8,644 SF

  Downtown Portsmouth Office Suites Available

  Office suites for lease in downtown Portsmouth, NH.

  501 Islington St Suite 3, Portsmouth, NH 03801

  View Details
• 

  $22 SF/Yr

  10,660 SF

  Retail Spaces in Hannaford-Anchored Plaza

  Retail and office spaces available in Portsmouth's West End.

  800 Islington St Units 10A & 10B, Portsmouth, NH 03801

  View Details
• Sponsored

  

  $129-$8,276/Mo

  11-1,292 SF

  Portsmouth

  170 Commerce Way, Unit 200, Portsmouth, NH 03801

  View Details
• 

  $14,500/Mo

  7,000 SF

  Retail Space on Route 1

  7,000 SF retail space in high-visibility Portsmouth location.

  2299 Lafayette Rd, Portsmouth, NH 03801

  View Details
• 

  $17 SF/Yr

  3,331 SF

  Two-Story Retail and Office Suite

  Two-story space with on-site parking and flexible layout for retail or office operations.

  72 Mirona Rd Suite 2, Portsmouth, NH 03801

  View Details
• 

  $20 SF/Yr

  5,793 SF

  Downtown Office Suites

  Two move-in ready office suites with efficient floor plans and excellent natural light in Downtown Portsmouth.

  25 Chestnut Street, Portsmouth, NH 03801

  View Details
• 

  $17 SF/Yr

  5,381 SF

  Retail and Office Building

  Two-floor retail and office layout with ample parking and convenient highway access for a wide range of users.

  72 Mirona Rd, Portsmouth, NH 03801

  View Details
• 

  $10 SF/Yr

  3,921 SF

  Portsmouth Office Space For Lease

  Versatile office space in Portsmouth, accessible from city or bypass.

  500 Maplewood Ave Unit A, Portsmouth, NH 03801

  View Details
• 

  $2,500/Mo

  856 SF

  Turnkey Florist Retail Space

  Fully built-out florist retail space with greenhouses in Portsmouth.

  1000 Woodbury Ave, Portsmouth, NH 03801

  View Details
• 

  $19 SF/Yr

  2,300 SF

  West End Office Space Available

  Second-floor office space in Portsmouth's West End.

  801 Islington St Unit 33, Portsmouth, NH 03801

  View Details

FAQs

What type of property is this?

Office units - Two leased office suites offer established layouts with private offices, meeting space, and shared building services.

Where is this office units located?

The property is located at 501 Islington Street Portsmouth, NH.

What is the lease rate?

The lease rate is $2,050 /Mo.

What are key features of this property?

This property features: Suite 1E: 762± SF on the 1st floor with 2 private offices, conference room, reception area, and shared restrooms; Suite 3: 8,644± SF on the 3rd floor with 5 private offices, 4 conference rooms, reception, open cubicle area, secure data room, kitchen/breakroom, and 4 restrooms; CAM includes water, sewer, heat, and air conditioning; electric usage is separately metered and paid by tenant