How to Get Secret Upgrades for the Kortz Center Heist in GTA Online

The Kortz Center Heist is here, and with it comes some secret upgrades that you don't know about (yet). While you will need a Mansion and the Art Studio to start the Kortz Center Heist, properties that you own and might have forgotten about actually play an important role. For instance, did you know that owning a Terrorbyte grants you more time in the Vault during the Kortz Finale? There are other secret passive buffs in the Kortz Center Heist, too, and you'll find them below.