The man who won the keys was representing the founder of F45 gyms, Rob Deutsch.
Although he left the gym in June, Bondi locals are speculating he may redevelop the property with apartments above a gym on the ground floor.
Ms Feuerstein, 95, knocked back several offers over the years to buy the flats, including from casino billionaire James Packer, who sold his own property four doors down in 2018 for $29million.
The site features off street parking for seven cars and three lock up garages and is prime for a redevelopment on Australia s most famous beach.
The man who won the keys was representing the founder of F45 gyms, Rob Deutsch (left)