Agree with 99% of your post, but these two ideas contradict each other.
Zoning/land use restrictions are things that lower the concentration of wealth (they literally cap the wealth of a parcel of land).
When you reduce/eliminate zoning controls, you will increase concentration of wealth, because the value of that land is now allowed to rise as high as private capital will allow it -- higher than it could have ever risen before. (This can be seen by the cities in the US currently reducing/eliminating their zoning).