Marcus & Millichap finalized the sale of The Gemma, a new-construction, mixed-use, 24-unit apartment property with retail located in Columbus, OH. Deal terms weren’t disclosed. The transaction also included the neighboring Carriage House, a new-construction two-townhome building.  Matt Snyder and Lisa Sickinger, investment specialists in Marcus & Millichap’s Cincinnati office, marketed the property on behalf of the seller, …