Located in the heart of downtown Portsmouth, 40 Congress Street offers a rare opportunity to own a boutique commercial asset in one of New England's most dynamic and historic markets. The 22,601± SF property sits on a 0.09± acre parcel and is zoned CD5 (Character District 5), allowing for a variety of commercial, office, and mixed-use uses including a possible residential conversion on the upper floors. Positioned within Portsmouth's vibrant Downtown Historic District and just steps from Market Square, the property benefits from exceptional walkability, strong surrounding demographics, and limited supply. 40 Congress Street offers a well-located asset with versatile use potential and strong long-term value. For more information, a signed NDA is required.

Copyright 2026 PrimeMLS, Inc. All rights reserved. This information is deemed reliable, but not guaranteed. The data relating to real estate displayed on this display comes in part from the IDX Program of PrimeMLS. The information being provided is for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated June 5, 2026 3:22 AM EDT

Name

Your Email Address

Phone

Message Send me the deed for 40 Congress Street Portsmouth NH 03801 (ID#:5084657)

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Name

Your Email Address

Phone

Message Send me the survey or tax map for 40 Congress Street Portsmouth NH 03801 (ID#:5084657)

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Name

Your Email Address

Phone

Message I would like more information for 40 Congress Street Portsmouth NH 03801 (ID#:5084657)

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Listing Tools

Property Details of 40 Congress Street

Property Details

Location

Interior Features

Basement

Map Location

Driving Directions

Keller Williams Coastal and Lakes & Mountains Realty
The NH-Maine Homes Team

Listing Tools

Property Details of 40 Congress Street

Property Details

Location

Interior Features

Basement

Map Location

Driving Directions

Hi there! How can we help you?

Hi there! How can we help you?

Hi there! How can we help you?

Keller Williams Coastal and Lakes & Mountains Realty The NH-Maine Homes Team

Keller Williams Coastal and Lakes & Mountains Realty
The NH-Maine Homes Team