It has been a few discussion about this. From the tread of "Quick question"
From my research, this is the criteria for FHOG,
- You and your spouse must not have previously held an interest in residential property in Australia prior to 1 July 2000. This includes investment homes - You and your spouse must not have previously held an interest in residential property in Australia on or after 1 July 2000 in which you or your spouse have resided (Ownership of an investment property after 1 July 2000 will not prevent you from obtaining the Grant provided you have NOT lived in the home)
The key is on the "(Ownership of an investment property after 1 July 2000 will not prevent you from obtaining the Grant provided you have NOT lived in the home)" which mean you can own a property as investent after 1 July 2000 and still being able to apply for the grant in future.