It's pretty common these days when buying a house to throw in a couple conditions with your offer. 

You're going to want a building report, your bank may want a property valuation before they agree to insure the property, and most commonly - you may need to sell your home first before your able to settle on the next one. 

But for a seller, any one of these could be a deal breaker - and could mean a lower offer is accepted over yours just because it's unconditional. 

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