The owners of an Embassy Suites by Hilton in north Columbus are showing off a $7 million renovation. Frontier Development & Hospitality Group LLC and Kana Hotel Group say the 224-room hotel boasts a redesigned lobby, restaurant and bar, along with improvements to guest rooms, banquet facilities and meeting space. There is an open-concept atrium with a second-story Wi-Fi connectivity area. The new bar area features a large back-lit “O,” which the companies say represents the Buckeye State. “The…