Ray White Northern Beaches agent Emma Blake said the sale price exceeded its $15.5 million to $17 million price guide.
Ms Blake said there was “exceptional interest” throughout the campaign, with multiple contracts issued as buyers competed for the once-in-a-lifetime opportunity.
"The property generated extraordinary interest from both eastern suburbs and local buyers, predominantly empty nesters seeking a stunning retreat where family could gather on weekends and holidays," Ms Blake said.
"The property's architectural significance, combined with its unparalleled beachfront position directly on Newport Beach, was a major drawcard.
"We leveraged social media extensively to showcase this very striking home, and it resonated strongly with the market - it really created a buzz.”