A few years later, on the money he earned, Tollefsen acquired a DJ set and started performing at neighbourhood school parties.

Soon he founded the Tollefsen Enterprises and skipped high school to dedicate himself fully to the business of renting out DJ-services and event equipment.

Later he founded Fredensborg AS, which is one of the largest owners of rental housing, owning more than 27,000 apartments across Scandinavia.

[5][6] Only in 2020, Heimstaden Bostad AB [de], controlled by Fredensborg AS, acquired 1732 buildings across Germany.

[4] Ivar Tollefsen made the 2022 Forbes Billionaires List with an estimated wealth of $6.4 billion and occupied the 398th position.