Hello Jalil.
I'm staying in Buenos Aires.
Is it practical for me to ask you to translate some financial documents from English to Spanish? How do I send them to you?
It's the 70/30 rule.
You pay 100 but report only 70.
You pay tax on 70. The buyer pays capital appreciation tax based on the lower report sales value: the 70. When it comes time for you to sell the property, you do the same.