Looks like Building 21 will no longer be accessible for Call of Duty: Warzone 2 free-to-play players. The recently released DMZ map may be hidden behind a new paywall after some users found mixed answers from several official sources, bringing more questions than answers to players wondering if accessing the Call of Duty: Warzone 2 map will require them to buy Call of Duty: Modern Warfare 2 in the future.