the solution to how to fairly value IP was provided by the owner, capital gains tax happens on sale of IP

https://news.ycombinator.com/item?id=47220210

capital gains does not happen on sale of land generally. These two things are obviously taxed differently because it is to the value of the government to do so, and the value of the government is supposed in many countries to somehow translate into a value for society.

Profits from property sales are often tax as CGT. It's only a select few jurisdictions that don't tax property sales, often with both CGTs and stamp duties.

The difference in how their taxed in the US is certainly not standard globally, nor is it likely to be optimal.