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A secret letter written by Queen Elizabeth has been locked in a vault in a historic Sydney building and cannot be opened for another 63 years.

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The death of Queen Elizabeth II and the new crown prince 111

The handwritten note was written in November 1986, following the restoration of the Queen Victoria Building in Sydney's central business district, and was addressed to the people of Sydney.

The letter sits in a glass case in a restricted area and no one knows what it says - not even the Queen's personal staff, Darric informed.

However, one thing is known - the letter can only be opened in the year 2085.

Addressed to the Mayor of Sydney, the instruction read: "Choose yourself a suitable day in 2085 AD, open this envelope and deliver my message to the people."

Simply signed "Elizabeth R."

The Queen Victoria Building, or QVB as it is popularly known, opened in 1898 and was named in honor of Queen Victoria's Diamond Jubilee the previous year.

Queen Victoria was Queen Elizabeth's great-great-grandmother.

There will be a day of mourning in Australia on September 22 in memory of Queen Elizabeth II

Elizabeth, who became queen in 1952, visited Australia 16 times - the first time just two years after she was crowned.

She was just 27 years old at the time and was the first reigning monarch to visit Australia.

It is estimated that around one million people came to see her in Sydney.

Elizabeth and her husband Prince Philip visited Australia regularly in the following decades.

Her last visit was in 2011 when she met then Prime Minister Julia Gillard.

The death of Queen Elizabeth II and the new heir to the throne

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