This document describes a master planned office development called Cornerstone at Tustin Legacy. It will be the largest master planned office development in Orange County, California, located near major transportation routes. The development will consist of four parcels totaling 35.1 acres that can accommodate between 610,000 and 1,070,000 square feet of office space. The development is envisioned as a flexible workplace connected to an up-and-coming mixed-use community with housing, entertainment, education and transportation.