Zocalo closed about ten months after the episode aired, in December, 2012.
"Zócalo" in Spanish is the proper name for the main square in Mexico City. It's also a common noun for a plinth; a slab-like member beneath the base of a column or pier, or a square base or a lower block, as of a pedestal.
There is a restaurant at Disneyland's Frontierland called Rancho Del Zócalo.