Reclusive Sydney philanthropist Isaac Wakil has left most of his remaining estate to his nephew, David Khedoori, while warning relatives that any challenges to the will should be rejected. Wakil and his late wife, Susan, amassed a fortune through long-term ownership of abandoned buildings before donating more than $100 million to cultural and educational institutions.

Wakil’s three-page will, signed in October last year, states that the couple built their wealth independently and that he had already made gifts to family members according to personal closeness rather than equally. It also places an eight-storey Sussex Street warehouse in a trust managed by Khedoori and KPMG partner Brett Mitchell; Wakil died aged 104 after selling the Vaucluse home he had shared with Susan for nearly 60 years for $55 million.