Gibraltar Industries has agreed to acquire Package Concierge, a Boston, Mass., company that makes package locker systems for apartment buildings.

The $20 million cash deal will combine two companies that already have a relationship. Gibraltar makes the package locker systems that Package Concierge sells.

The acquisition will expand Gibraltar's presence in the package delivery locker market, which is growing as online shopping expands. Gibraltar already makes a variety of mail box products, from single-family mail boxes to cluster mail boxes used in multi-family settings.

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