The most favorable and the fastest residence permit program in the European Union is that of Greece.
It is possible to have a residence permit within 40 days with a real estate investment of only € 250,000. The real estate investment can be residential or commercial.
By obtaining a residence permit in Greece, you can easily have the free movement right in 26 Schengen countries under the Golden Visa program.
The residence permit includes all family members including the real estate owner, his/her spouse, his/her children under 21, his/her parents, and the parents of his/her spouse.
Since there is no obligation to reside in or visit Greece, the real estate can be rented out.
In Greece, you only pay tax on your relevant rental income. Your income in other countries is not subject to taxation.