如你只擁有50% investment property, 有可能唔過 threshold, 唔洗交 land tax。
http://www.osr.nsw.gov.au/taxes/land/
How does the threshold work if I own several land items?
If you own several land items, the value of all your liable land will be added together. You will then be charged land tax on the combined land value above the land tax threshold.