909 Islington St 1,012 - 5,212 SF of Flex Space Available in Portsmouth, NH 03801

Set within a beautifully restored mill-style building, this space combines historic character with modern functionality. Featuring tall ceilings, abundant natural light from new windows, and a private entrance, the unit offers a flexible layout suitable for a wide range of uses — from professional office or studio to customer-facing retail or service concepts. The Landlord will deliver the premises in conditioned shell condition and provide a Tenant Improvement Allowance to support customization. Recent building improvements include a new roof, upgraded common bathrooms, and enhanced building systems. Tenants also benefit from access to landscaped outdoor green space and ample on-site parking for employees and visitors. With its blend of authentic mill architecture and modern upgrades, this space provides the ideal canvas for your business to thrive.

This industrial mill-style unit is currently in a raw condition, offering the opportunity for customization within a character-rich brick and timber building. Featuring exposed brick walls, impressive ceiling height, and clerestory windows that bring in natural light, the space provides a dramatic architectural foundation for a wide range of commercial uses. We plan to deliver the premises in “vanilla box” condition, either through landlord-performed improvements or via a Tenant Improvement Allowance, allowing the future tenant flexibility in designing the final layout and finishes. With its scale, vertical volume, and authentic industrial character, this space presents a unique opportunity to create a fully customized office, studio, retail, showroom, or creative environment tailored to your business needs. As can be seen in the photos of the space, this suite offers a loft-style element as well, which will be accessible by stair following unit improvements.

This spacious industrial-style unit features tall ceilings, exposed beams, and large arched windows that fill the space with natural light. With an open floor plan and flexible layout, it could be ideal for creative studios, workshops, or businesses looking to customize a unique, character-rich environment.