PORTLAND ( AP) — The Maine Turnpike Authority has sold its former headquarters building in Portland to an electrical engineering consulting firm nearly three years after putting it up for sale.

Officials say ComNav Engineering Inc. has agreed to buy the 9,800-square-foot building on Riverside Street for $575,000. The turnpike authority put it on the market for $925,000 when it moved into its new headquarters in the spring of 2009.

ComNav plans to move into the building by the end of May. The company has 37 employees.

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