Question: The designer of the Caja Madrid Obelisk was born in what year?
Sentence (from "Santiago Calatrava"): Santiago Calatrava Valls (born 28 July 1951) is a Spanish architect, structural engineer, sculptor and painter, particularly known for his bridges supported by single leaning pylons, and his railway stations, stadiums, and museums, whose sculptural forms often resemble living organisms.
Relevant evidence: Yes