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Queen Elizabeth II owns a huge property empire, most of which she couldn't sell if she wanted to.
According to the $4, the Queen has an overall fortune of around £340 million. $4 that a lot of this is spent maintaining her various properties, as well as other important things like helicopters.
She also owns land. Lots of land. The Queen is the $4, which includes swathes of central London and much of rural England and Wales.
What's more, she's the legal owner of the Crown Estate, which is now a private company, but still pays the Queen 15% of its profits via the Treasury. The Crown Estate owns almost all of Regent Street and the $4 - the company is $4
In short, the Queen "owns" immense amounts of property, but she couldn't sell most of it if she wanted to.
Of her entire portfolio, her prime properties are split between four "official residences" and two privately-owned residences - passed down from her father, George VI. It's in these six opulent houses that the Queen spends almost all of her time.