Euromast is an observation tower in Rotterdam, Netherlands. The tower was built from 1958 to 1960 for the 1960 Floriade. It has been a national monument since 2010. To make the tower more stable, it was build on a block of concrete of 1,900,000 kg (4,200,000 lb). It has an observation platform 96 m (315 ft) high, and a restaurant. Originally, at 101 m (331 ft) tall, it was the tallest building in Rotterdam. Then it lost that position for a few years. It became the tallest again when the Space Tower was built on the top of the building in 1970. The Space tower made the Euromast 85 m (279 ft) higher.