A Key Largo real estate company pocketed a multimillion-dollar office asset in a deal that closed in just 21 days.

Ocean Reef Club Real Estate Co. sales associate Mary Lee represented both buyer and seller in the transaction at the members-only Ocean Reef Club in Key Largo. The three-story office building sold for $21.2 million, according to a news release issued Monday. The 24,673-square-foot Plaza Building property sold for about $860 per square foot.