Hi Beenut, "ESTUDIO 19" could be one, they have a great array of vintage and new gear, here's their poorly designed webpage but don't get fooled by that since it's an awesome studio: http://www.estudio19.com.mx/
You're talking about Mexico City right? Or are you asking about studios anywhere in the whole country?
Could you help me? I'm a producer working with a band from L.A and we've all decided that Mexico is where we would like to record. I'm a true lover of analogue and the lovely desk you're leaning over is the kind of thing we're looking for. Do you know of any studios in Mexico that have a great console, maybe some pultecs, Urei, Fairchild, old neumanns, you know, the good stuff. No worries if not man.
All the best