The tower at the top is designed around an open tubular structure on an 8x8 meter square base, and tapers to the tip of the spire from the fourth platform upwards.
Two satellite dishes are mounted on the lower platform, each 6.8 metres in diameter. The middle platforms are structurally designed to support eight 2-meter microwave dishes, and the highest platform is capable of holding assorted communication equipment.
Including the spire, 120 Collins Street was Australia's tallest building when it was completed.
The building is topped by a 43-meter communications tower and decorative spire.
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