PHOTO: 69 Wimbledon Avenue, North Narrabeen, smashed its reserve price by $900,000 at auction. Photo: Upstate

Sydney’s stunning run of auction results continued at the weekend, with not even a freak weather event enough to put off the city’s most determined cashed-up buyers.

A Bondi Beach penthouse sold for $20.1 million at auction on Saturday, becoming the most expensive apartment sold at auction in Australia, while elsewhere agents took bids from buyers in bus shelters and under the cacophony of rain pelting onto corrugated iron roofs.

The owner of a lakefront northern beaches home was left speechless after his property went to auction and sold for an eye-watering $900,000 over its reserve.

The three-bedroom house set on the waters edge at 69 Wimbledon Avenue, North Narrabeen, was marketed with a guide price of $3.75 million, so when the owner received an offer of $4 million two weeks from the auction, he was ready to take it, marketing agent Lachlan Yeates, of Upstate, said.