PMP Practice: Prepare the schedule based on methodology

Birch Tanaka is managing a sixteen-month pharmaceutical manufacturing plant construction project for Velvet Hippo Biologics. The project involves four major building phases, strict regulatory approvals at defined milestones, fixed contractual completion dates with penalty clauses, and coordination with three concurrent IT infrastructure projects using agile methodologies. During month three, the IT teams request that Birch's team adopt two-week sprints and iterative delivery to better synchronize dependencies. However, Birch's construction permits specify completion dates for foundation work, and her equipment vendors require twelve weeks advance notice for specialized HVAC system delivery. The CFO is concerned about budget predictability, and regulatory inspections are scheduled at fixed intervals tied to construction phase completeness. What approach should Birch take?