Most banks and casas de cambio (exchange offices) change cash and traveler’s checks, but some handle only euros and US or Canadian dollars. Rates vary, so check a few places. Mexico City is one of the few cities in the world where the exchange offices at the airport actually offer competitive rates. Exchange offices in town include CCSole and Centro de Cambios y Divisas.
The greatest concentration of ATMs, banks and casas de cambio is on Paseo de la Reforma between the Monumento a Cristóbal Colón and the Monumento a la Independencia.