Convention Center parking expansion would serve Hilton, enable new Nationwide offices
Premium content from Business First - by Brian R. Ball
Date: Friday, July 22, 2011, 6:00am EDT - Last Modified: Thursday, July 21, 2011, 5:01pm EDT

Plans are moving ahead to double the capacity of the Greater Columbus Convention CenterbizWatch ’s west parking garage, a project that could presage office construction downtown by Nationwide Mutual Insurance Co.bizWatch
The Franklin County Convention Facilities Authority has asked the Downtown Commission to approve adding two decks to the five-level, 887-slot garage. The $14 million project would provide 916 additional spaces to the convention center and a Hilton hotel under construction on North High Street. But the bulk of the new parking likely would be reserved for Nationwide, which has interest in leasing up to 600 spots for offices it is considering building on 2.6 acres at Front Street and Nationwide Boulevard, across from its headquarters.
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http://www.bizjournals.com/columbus/print-edition/2011/07/22/convention-center-parking-expansion.html
The article also mentions Nationwide would want 600 spots reserved for the future office building next to it. Given the number of spaces it sounds like this new structure will probably be in similar size the rest of the arena district, 5-7 story building.