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Integrative design relies on short, iterative feedback loops when decisions are still malleable. Lightweight energy models test envelope tweaks (WWR, shading, insulation, airtightness), lighting power and daylight controls, and ventilation strategies. A parallel water balance quantifies indoor fixtures, irrigation needs, cooling-tower cycles, and any alternative sources (rainwater, condensate, greywater). Each iteration should roll into updated OPR/BOD targets and into enforceable specifications—metering points, sequences of operation, acceptance criteria, IAQ requirements—so intent survives value engineering. Commissioning authority (CxA) milestone reviews help keep drawings aligned with targets. Deferring analysis (Option A) forfeits low-cost choices. Vendor-driven “optimization” at bid (Option C) undermines system synergies and often sacrifices performance. Focusing on HVAC alone (Option D) ignores upstream load reductions that right-size equipment and cut capital and operating cost. The B path preserves agility while producing a documented, auditable trail that smooths LEED reviews.