The first ground-up unit of The Home Depot in Mexico opened last month. At 77,000 square feet, the store in Monterrey near the California border is about one-third smaller than a traditional Home Depot, but features a garden center and pro desk. The store is among four to be built in Mexico this year, with others planned for Tijuana, Culiacan and San Luis Potosi to open this fall. Home Depot entered Mexico last summer by acquiring four-store Total Home, then bought the four-store Del Norte chain this year. Home Depot now operates nine stores in Mexico.