The history of San Diego isn't contained solely in books or museums. In fact, an interesting lesson in one aspect of San Diego history -- its commercial real estate -- can be gleaned merely by driving through the city's sub-markets of Kearny Mesa, Miramar and Sorrento Mesa. And, if you ask Tim Hoag, a senior director of commercial investment property sales in the Golden Triangle office of Cushman & Wakefield, its bright future can be seen in Poway, Rancho Bernardo and along the Interstate 15 corridor.