The owner of the house has sold it to the municipality for 375,000 US dollars (320,800 euros), reports US TV station WGN (Friday local time).
He had only bought it in 2024, before the election of the first pope from the USA, for 66,000 US dollars and then renovated it.
The Dolton City Council voted at the beginning of the month in favour of purchasing the three-bedroom brick house and converting it into a tourist site.
According to radio station WBEZ Chicago, the parents of the future pope bought the house in 1949 and resold it in 1996.