You buy the land, the consultant brings a plan, the committee approves it. Nobody in the room can say what the alternatives were worth, because nobody priced them. The plan that gets built is the plan that was drawn.
A siting decision is irreversible for twenty years and it is made from a market study bought eighteen months ago and a recollection of how the last community absorbed.
The model prices every alternative before the plan is submitted. Lots achievable inside the zoning envelope against lots on the plan. Product fit tested against your own closings rather than a purchased study. The carry cost of opening a phase into a submarket that is not ready.
What comes out is a decision record — every alternative considered, what each was worth, and why the chosen plan won. That record is what survives the committee asking where the number came from.
Lots the zoning, servicing and market already support that never reached the approved plan.
A plan sited where its price point underperforms. Paid for in standing time and incentive, not in a line item.
A phase opened before the one ahead of it absorbed. Finished lots carried above target.
Premium-capable lots sited without the premium captured. Priced by a different model, and credited there.
The rest of this model — the data sets it runs on, the cause split, the working behind the reference figure and a sample output — goes out by email. Two fields, nothing else.