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There are many buildings in the database from Mexico City without their own drawing. Perhaps you could draw some of them. I made a list, with the SSP building adress, and some pictures that i took or other forist, so you can have an idea of how the building looks like. However, i don't have pictures from all of them, so i put for everyone a link to Emporis, where you can have lots of pic, so you can have more options.