Wind back three years and you could pick up an average apartment in the inner Sydney suburb of Ultimo for around $560,000.

Flip that today and you would get around $760,320. Those in nearby Surry Hills could have also done well, as the average apartment which would have set you back $572,000 back then will now fetch $790,000 (data from realestate.com.au). This means many who have purchased apartments ‘off the plan’ in…