Tyga -- Sued Over Malibu Mansion ... PAY UP OR GET OUT!

"Rack City" rapper Tyga owes WAY more than ten, ten, ten, twenties, and them fifties on his rented Malibu mansion -- so says Tyga's landlord ... and now, the guy's suing to get his money.A man named Gholamreza Rezai filed the lawsuit against Tyga…