Plaza y conjunto. Mathias Goeritz

Among the drawings is the sketch of two lovers that Goeritz showed the poet Olivia Zúñiga in 1953, which she turned into a book of poems. Five years later it became an eight-tonne concrete sculpture outside Acapulco's Hotel Presidente. Since October it has stood in the plaza above you, back in Goeritz's favourite salmon orange.

You go down to a 226-square-metre basement room laid out, the curator says, like the Torres de Satélite. His argument is that Goeritz worked best in teams, so the plans, models and photographs come from projects with Barragán, Pani, Legorreta and Sordo Madaleno, plus sketches for a children's park that was never built. Goeritz's lovers have moved before: another pair, Tú y yo, stood at a Renault dealership before reaching Ciudad Universitaria.

It's mostly paper, so pair it with the real sculpture outside. Entry is free, Tuesday to Friday 11:00 to 18:00 and weekends 11:00 to 14:00. In January the show moves to the second floor.