If you travel to the property in relation to installing say the airconditioner or carpets (ie depreciating assets), you can add the cost of the travel etc to the item and depreciate it over the life of the item. That is actually documented in one of the ATO's new booklets on depreciating assets.
If you travel to the property to assist with the installation of some item of the building (eg a clothesline), then you may be able to add the cost of the travel to the building cost and depreciate that at 2.5% (but I think that is more of a grey area).
Also if you travel to the new property to say, meet the new Property manager and give them a copy of the keys, you should be able to claim some travel costs for that.
Travel to the property to do the practical completion inspection, or to assist with the landscaping, is more likely to be part of the cost base ie you can't claim it till you sell.
So it really depends on exactly what you are doing, and you may have to apportion it.