The rules regarding Land tax are more complicated than the CGT it seems.
Absence from Principle Place of Residence Exemptions:
Land Tax Management Act 1956 (NSW),
Schedule 1A
http://www.austlii.edu.au/au/legis/nsw/consol_act/ltma1956173/sch1a.html
See also:
Revenue Ruling No. LT 82 The...