IPNdeM press release, December 1947.  (My translation.)

The Instituto Politechnico Nacional de Mexico announces with great pride that Professor Albert Einstein will hold a visiting fellowship at “el Poli” for Spring Semester 1948.  While Professor Einstein will not be teaching any classes, he will give several public addresses and be available for consultation during his stay.  He will reside at a private home at #45 Avenida Viena in Coyoacan.