Cervecería Lesnez is based out of San Luis Potosí and produces the 7 Barrios line of beers. I'm generally not impressed, although their Brown is pretty decent. They also make an blond ale which I haven't seen available anywhere in the city.
7 Barrios Amber Ale, 2 out of 5, 5.1%ABV
This beer was fairly nutty, with hints of caramel and vanilla. Definitely did not taste like an amber ale to me. It may have been too old and certainly wasn't enjoyable.
7 Barrios English Brown Ale, 4 out of 5 , 5.1%ABV
The Brown is the best of the 7 Barrios beers I have tried. It was easy to drink and slightly hoppy, not something I'm used to tasting in most of the boring brown ales available in Mexico City.
7 Barrios Hefeweizen, 1 out of 5, 5.1%ABV
Wow, this is one of the worst hefeweizen's I've ever had. Very weak and light, almost no flavor at all. There is a slight hint of sourness to it that makes it unpleasant.
You can buy all three of these beers at La Belga.