The first of two Downtown 7-Eleven convenience stores is expected to open today at 123 Julia St., at Julia and Forsyth streets. A second Downtown 7-Eleven is under development at State and Main streets. The chain announced in March that it would open 15-20 new stores this year in Jacksonville with a goal of 80 or more by 2015. Each store employs at least 10 people and generates about $100,000 in city sales and property tax revenue, the company said in a news release. Dallas-based 7-Eleven said it was returning to Jacksonville after a noncompete agreement expired with Gate Petroleum Co. Jacksonville-based Gate bought 28 7-Eleven stores in 1990 and converted them to Gate stores.