Tucson, Ariz. -- A 17-acre parcel of land at the northwest corner of Houghton and Old Vail Roads in southeastern Tucson, Arizona, is slated to become a new retail and restaurant hub. The site work has begun at Las Plazas at Old Vail, in the form of under-ground utilities, grading, retention/detention, common drive aisles, landscaping, curbs and parking lot lighting.