To start casino missions in GTA Online, you need to own a Master Penthouse at the Diamond Casino. Purchase it from the casino website for $1.5M-$6M depending on options. After buying, you'll receive a call from Ms. Baker to begin the first mission "House Keeping". Complete all 6 missions to unlock the Casino Heist.
After completing these, you unlock the Diamond Casino Heist — the most profitable heist in GTA Online.
🏆 Final Reward:
Completing all casino missions unlocks the Diamond Casino Heist with potential earnings of $10M+.
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