Sydney’s top-end luxury property market will be buoyed by growing confidence, rising prices and improved supply with records set to tumble in the best-performing postcodes, according to national property valuer Herron Todd White (HTW).

A record price of $25 million set two years ago is expected to be topped at a forthcoming auction for 1473-square metres of waterfront land in Mosman,  about eight kilometres north-east of Sydney’s central business district (CBD).