Sinclair Condominium Association is a small residential condominium community located on Sinclair Avenue off High Street in Somersworth. Public property records identify condominium units at both 1 and 3 Sinclair Avenue, with the association consisting of a limited number of low-rise residential units on a roughly 1.24-acre setting. Its quiet neighborhood location provides a residential atmosphere while remaining close to Somersworth's commercial areas and transportation routes.

The development was built in 1988 and consists of wood-frame, clapboard-sided residential buildings with asphalt-shingle roofs. Public listings characterize the units as garden-style or multi-level condominiums, generally around 816 square feet in the available records. Individual units offer single-level garden-style living with approximately 816 square feet of functional layout, including 2 bedrooms, open kitchen/dining areas, bright living spaces, and private exterior balconies.

The association provides basic grounds and winter-maintenance services rather than extensive recreational facilities. Current public listings report a $100 monthly condominium fee covering landscaping and plowing, with some listings also identifying a one-time reserve contribution. Assigned and on-site parking is available to residents. No community pool, clubhouse, tennis court, or other major shared recreation amenity was verified.

Sinclair Avenue is conveniently located near High Street, schools, shopping, and NH-16. Public listings emphasize the property's accessibility to downtown Dover as well as nearby shopping and commuter routes. The small association size and modest fee structure make the community oriented toward practical, low-maintenance ownership rather than resort-style condominium living.