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| | Sydney Tower Oz Trek |
 | | The office component was completed in 1974 and the final stage of the complex, the Sydney Tower, was opened to the public in August 1981. |
 | | The 420 windows of the tower are cleaned by a semi-automatic window-cleaning machine, which recycles and filters 50 litres of water. |
 | | A 162,000 litre water tank, the tower's primary damping system, one million dollars worth of fire protection equipment and countless sprinklers add to the safety standards which far exceed normal building requirements. |
| www.sydneytoweroztrek.com.au /tower.html (249 words) |
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