A downtown economic-development project that has been planned for three years — and hoped for over the course of more than 16 years — is finally moving forward. Officials with the Piedmont Triad Research Park said they have reached an agreement with Wexford Science and Technology LLC of Baltimore on an $87 million project for the North District. A formal announcement, which will involve Gov. Bev Perdue, is set for 11 a.m. today.