She listed her Californian ranch in the Santa Ynez Valley for $7.7 million (USD $5.4m or £4.4m).
But in October 2021, Newton-John transferred full ownership of her Santa Barbara estate to her husband, John Easterling, where she spent the last remaining days, according to the New York Post.
The source revealed to the outlet: “She was in a lot of pain, but she was a fighter.
“The place was her heaven on Earth and it gave her many calming moments in her final days.”
Newton-John also put her farm in Dalwood in the New South Wales countryside on the market, which sold for a staggering AUD $6.6 million (USD $4.6 or £3.8m).
The New York Post reports that the ‘Let’s Get Physical’ singer bought the land in the 1980s and renovated the property in the 2000s.
According to realestate.com.au, the land is described to be French style possessing four bedrooms, three main bathrooms and a one-bedroom guest suite sprawled across 189 acres.
Jillian McGrath told The Daily Telegraph at the time of the listing: “It is hard to describe the serenity.
“And Olivia really wants someone who will love the property and continue her work, someone who will take up where she left off.”
The property also borders the Victoria Park Nature Reserve, securing its tranquillity and seclusion.
The New York Post claims the sales helped the national treasure invest more money into her foundations before she passed.
The source said: “She wanted to leave behind something that would last, and something that her daughter, too, could benefit from.”
The late actor founded the Olivia Newton-John Cancer Research Institute in 2015. The institute currently has 140 research studies underway, with scientists involved with 200 ongoing trials.
While speaking to Entertainment Tonight, Newton-John said of the organisation: "I'm so excited. This has been something that's been in my heart and my mind for many years.
"Being a cancer thriver of 28 years and having gone through surgery and chemotherapy and radiation I always had this dream that we could find kinder ways of treating cancer."
Featured Image Credit: Dee Cercone / Everett Collection / Alamy Stock Photo. realestate.com.au.