CHICAGO — PerkSpot has signed a 14,020-square-foot office expansion at 320 W. Ohio St. in Chicago. The customized employee discount firm now occupies more than 27,000 square feet at the building. It is the company’s second expansion in the last 13 months. Allen Rogoway of Cresa Chicago represented the tenant in the lease transaction. PerkSpot offers a perk program where employees can gain rewards and exclusive discounts for their performance. PerkSpot also offers discounted merchandise and services and receives a commission on the value of items sold through its platform by merchants.