When measured either by the height of its roof, or by the height of its highest habitable floor, Eureka Tower was the tallest residential building in the world when completed. It was also the building with the most floors available for residential occupancy in the world. The building stands in height, with 91 storeys above ground plus one basement level. At the time of its completion, it was one of the only buildings in the world with 90 or more storeys. It is also the third-tallest building in Australia and the second tallest building in Melbourne, behind Australia 108 which topped out in November 2019. The single level basement and first 9 floors contain car parking. The building's proximity to the water table as well as the Yarra River made the construction of a basement car park uneconomical. In all, there are 84 floors of apartments (including some floors shared between car parking and apartments), with the remainder being used for building facilities and the observation deck.