I bought a house in Vantage last year; it is 4 BED / 2 BATH property, price was 512+18=530K
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What is the $18k you are referring to? Is that the stamp duty? If so, you can't expect to get that back from the next buyer.
The difference is only around $20k and you are competing with new stock, which for some buyers comes with a $15k grant.
The market is flatter at the moment in Gladstone, which makes it a good time to buy, not to sell.
Also, if you had furnished it and were getting $900+ per week on a 2 year lease you wouldn't have any issues with getting your money back. $670 isn't a great yield for an investor at that price point. I am getting up to 10% yield furnished, at purchase price in Gladstone. ($1,100 per week just signed up for a 4 bed, 3 bath townhouse).