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PORTSMOUTH, N.H. — Locally based development and investment firm The Kane Co. has completed construction of a 91,000-square-foot office building at 145 Maplewood Ave. in Portsmouth, located in the southern coastal part of the Granite State. New Hampshire-based firm PROCON handled design and construction of the project, which includes ground-floor retail space. Tenants include Heinemann Publishing, Steward Partners and Sentient Decision Science.