About 400 people gathered to toast its best-known rum, Havana Club, but not with Cuba libres, mojitos and daiquiris in hand
Bystanders and police watched as the 54-year-old climbed up and then descended the Torre Agbar, a glass-covered office building known for its night-time illuminations, completing the feat in around one hour.
Robert has conquered over 100 structures worldwide including San Francisco's Golden Gate Bridge, Dubai's Burj Khalifa complex, the Eiffel Tower in Paris and the Sydney Opera House without safety equipment.