Stregoika

For several years there was a digital clock in the upper floors that indicated even tenths of a second! This building, the oldest skyscraper in Mexico, represents the beginning of Mexico City's modern era. When completed it was the 45th tallest building in the world.
At the time of completion, this was the tallest building in Latin America.
The elevators are operated manually by building staff and the top three floors contain the second tallest public observatory in the city from which I took this pic :)