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Lupoli Cos. is expanding its portfolio of properties in Littleton, where the Lawrence developer already is planning a redevelopment of the former IBM campus.

The latest acquisitions include a 19th-century factory converted into multitenant flex space at 410 Great Road, along with a small lot at 450 King St., which sold for a combined $5.3 million.

In September, Littleton residents protested the cluster of gun dealers operating in the former mill building. In January, one of the dealers was charged with conspiracy and possession or transfer of a machine gun after he allegedly sold firearms to a straw buyer.

The Stubblebine Co. represented sellers MIR Associates Realty Trust and 450 King Street LLC in the transactions, while Stonybrook Advisors represented Lupoli Cos.

Digital Federal Credit Union provided $4 million in mortgage financing.

The 107,786-square-foot commercial building was completed in 1880 for Conant Houston Co., which manufactured cider, suspender and military webbing, and currently includes multitenant space.

Lupoli Cos. acquired the 42-acre former IBM office campus on King Street in 2021, and received approval last year to rezone the property for mixed use development including nearly 800 housing units, retail space and office-to-lab conversions. The company did not return a message seeking additional information on its plans in Littleton.