Jun 18, 2026 – 5.00amGerman footwear billionaire Alex Birkenstock and his wife Vanessa have emerged as the buyers of the $20 million Double Bay penthouse and long-term Sydney base of late Perth socialite Eileen Bond.The harbour-side penthouse in Sydney’s blue-chip eastern suburbs is the Birkenstocks’ latest luxury purchase, bringing their Australian property spend to $163 million after purchasing a Rose Bay mansion, a Barangaroo apartment and a home in Melbourne’s Brighton.Subscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles