Dec 8 $512,000 Dec 9 $537,600 Dec 10 $564,480 June 11 $578,592 Agent 2% $590,163.00
Just my rough figures above.
Id go in with the offer of either $578,500 or $589,500
One gives them a 5% return p.a and the other includes the possible agent fees.
Not saying its your problem to make sure what they make,but if you want the property then I always say be realistic, not too lowball but not over the top.
You could say property in Perth hasnt moved since they bought, however the suburb you mention seems to be one that has shown some growth.
Assuming the vendor thinks the same (which they will) then I would be using the above as a basis in which to make an offer.
Assuming $635k is about the money, then go in with $578,500 followed by $589,500 final offer.
The first offer will probably somewhat shock them into reality but they will think you may come up a tad, and even tell the agent you have not much more room to move, then if need be come back with the second offer closer to $600k ie: $589,500
