The Queen actually owns Sandringham (1862) and Balmoral (1852), both were bought by Queen Victoria and Prince Albert. Upkeep for both is met by the Royal Family themselves. Castle of May was privately owned by the Queen Mother and was left to Prince Charles in her Will. So deduct those from the list of money earners they do not enter the equation.

I love the way "socialists" have this uncontrolled desire to tell people what THEY have to do, yet somehow the same strictures conveniently do not apply to themselves.

Places such as Windsor Castle, Buckingham Palace and Holyrood are all "Official" Residences owned by the Government (Crown Estate) and are therefore are not options for disposal as your "President" would have to "officially" live somewhere and "officially" entertain somewhere.