Wouldn’t it work to have the government run an auction-style website where the self-assessed property values are kept hidden, but people can submit a bid to buy

Wouldn’t it work to have the government run an auction-style website where the self-assessed property values are kept hidden, but people can submit a bid to buy a piece of property. If that bid is greater than or equal to the property’s assessed value, the property owner is given the option to increase their valuation to just above the bid price. If the property owner instead decides to sell, the bidder is obligated to go through with the deal (perhaps at the assessed value rather than the bid price).