Maybe somebody living in STI can explain it better.
The old and smaller one is on the road, where La Sirena is, and where the offices are for the plan piloto. You follow that road to the traffic lights, take a right, continue on this road for about a mile. On your left you will see a big Ochoa sign, which are the warehouses. You make a U-turn there, and 50 yards further, at the shell station you take a right. After about 20 yards, you will see the big Ochoa on your right. You cannot miss it.
Sorry for the crazy explanation. I do not know any streetnames, just know how to get there... lol
Please, do not punch me out, if you get lost!!!!