@Kostas_matak
as I mentioned above, some countries may allow an inflation adjustment to the cost basis, but US tax law does not. If you are required to pay capital gains tax in the country where the property is located, you would follow that country’s tax laws in determining what tax was owed. Under US law, your cost basis is the original purchase price converted to US dollars using the conversion rate in place on the day of the purchase, or the average conversion rate for the entire year (which I believe is published on the US Treasury web site). There is no adjustment to the cost basis for subsequent inflation.
