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WALTHAM, MASS. — American Realty Advisors has completed the disposition of an office complex located at 10, 40 and 52 Second Ave. in Waltham. The three-building property consists of 294,663 square feet. The price and the buyer were undisclosed. At the time of sale, the property was 94 percent leased to a variety of tenants, including Massachusetts General Physicians Organization Inc. and National Grid.