That is actually a communist idea: let the government take almost the whole value of a property. The whole point of a land value tax is to take the rent. Funnily enough that leaves a property worth a pittance. Everything I have read about land-value-tax seems to just ignore that glaring problem. PS: I have no love for property investors, they often screw up people’s lives: however blanket tax changes screws over the good as well as the wicked.
Edit: I’m happy to be corrected. Commercial investment property is valued based the return you get from it. If the return drops drastically (the point of a land-value-tax) then the property value drops drastically. Sucks if you retired and invested your life savings into an investment property, only to have all returns taxed away.
Edit 2: discussing property values has become politicalised. Everyone seems to trot out some memetic idea (left example: land-value-tax-for-the-win; right example: state-housing-is-theft-from-productive-members-of-society) but few people seem to actually think through the consequences of an idea.