It could be made palatable to regular people by making a high tax free threshold. Most homeowners could be left unaffected.
That leaves 50% of land owned by the 1%. A fair chunk.
Additionally the money could be funneled initially into pensions for the impoverished elderly.
Capital/billionaires would fight back by arguing that it would hit the elderly the hardest just as the howard jarvis taxpayers foundation did with prop 13 but if it was very obvious how many elderly people were helped, crying about grandmothers having to sell multimillion dollar mansions would probably backfire.
They would throw immense resources at trying to discredit and kill this, though. They would use every character assassination trick in the book to stop those pushing it. Some would probably also resort to violence if that failed. It would be an uphill battle the whole way.