93 Pleasant Street, Treadwell Mansion

Portsmouth, NH




Historic Rehabilitation



93 Pleasant Street, Treadwell Offices


Restoration, rehabilitation and new construction 40,000sf


Project completed by Arcove founder, Tracy Kozak as Lead Designer and Project Manager while employed at JSA Design. Architect of Record: ARCove Architects with design assistance by JSA Design.

A stately, federal era mansion house with notable history, will receive much needed restoration and rehabilitation. Previously this was the home of a sea captain’s widow, notorious sheriff, renowned state politician, and later a hotel, and community gathering hub for the Elks Club. Upgraded MEP systems, masonry and carpentry repairs, structural reinforcements, and deep energy retrofits for the existing building will improve comfort and operational expenses. A substantial new addition is planned for the rear of the building, with three levels of office space and underground parking. The addition responds and defers to several magnificent historic buildings within its viewshed, while utilizing new technologies for sun shading to reduce solar heat gain and reduce glare. The historic 18th century stone retaining wall defining the street edge will be carefully preserved and visually screen below grade parking. Aesthetically integrated handicapped access is provided throughout the historic building, and uniform daylighting with access to outdoor spaces is available for the wellness of occupants.