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A landing zone is the foundation, not the app: the account layout (OUs, a Log Archive account, an Audit account), central sign-in, central logging and guardrails. Because it’s defined once and stamped out the same way every time, it’s repeatable and easy to grow. Need another account? Account Factory makes one that is already wired in. You can build a landing zone with Control Tower (the usual way), with the Landing Zone Accelerator solution, or by hand with your own infrastructure-as-code.