A pro forma is a model of assumptions. Make them visible.

Translate the scheme into a financial program

Begin with a reconciled area and unit schedule. Distinguish gross construction area, rentable or saleable area, common space, and zoning floor area. Assign costs and revenue to the correct bases: a construction rate applied to gross area and a rent applied to rentable area are not the same calculation. Model a rental hold and a for-sale project with the cash-flow structure appropriate to each.

Build the uses before choosing the financing

The development budget should identify land and acquisition costs, building and site work, professional services, permits and fees, contingencies, financing costs, and the costs of leasing or selling. State which allowances already sit inside a rate so you do not count them twice. Tie quantities to the scenario rather than retaining the budget from an earlier, larger scheme.

• Hard costs: building work, infrastructure, demolition, and site improvements.
• Soft costs: design, surveys, legal services, permits, and other project services.
• Contingency and escalation: separate uncertain scope from changes over time.
• Carrying and financing costs: fees, interest, and the time capital remains committed.

Work a simplified operating year

Assume 20 rental units at $2,000 per month: annual scheduled rent is $480,000. Apply an illustrative 5% vacancy and credit-loss allowance ($24,000), add $12,000 of other income, and effective gross income is $468,000. With assumed operating expenses of $180,000, net operating income is $288,000. These are invented teaching inputs—not market rents, underwriting standards, or a LinkWave prediction.

Do not mistake NOI for distributable cash

NOI is before debt service. In this example, $220,000 of annual debt service leaves $68,000 before capital expenditures, reserves, income taxes, and other below-NOI items. The illustrative debt-service coverage ratio is $288,000 ÷ $220,000 = 1.31×. A lender may define the inputs and required coverage differently; this is not evidence that a loan would be offered.

Keep yield, value, and return distinct

At an assumed total development cost of $4.8 million, the example’s stabilized yield on cost is 6.0%. Capitalizing the same $288,000 NOI at an assumed 6.0% rate also gives $4.8 million; that numerical match is an assumption, not an appraisal. At 6.5%, the indicated value falls to about $4.43 million before sale costs and debt repayment. Yield on cost is not an equity IRR or a profit margin.

Put the project on a timeline

Schedule acquisition, design, entitlement, construction draws, completion, lease-up or sales, and any refinance or exit. Interest depends on the amount and duration of borrowing, not simply the final loan balance. Equity IRR uses the timing and amount of equity cash flows; an equity multiple does not describe how long it took to receive those distributions. Label whether reported returns are levered or unlevered and pre- or post-tax.

Test what would change the decision

For the example, reducing rent by 5% while retaining the 5% vacancy allowance, $12,000 other income, and $180,000 expenses reduces NOI to $265,200. A 10% increase in total development cost raises the cost to $5.28 million; base NOI then gives a 5.45% yield on cost. Combined, those changes produce about 5.02%. These tests hold other variables fixed; a real downside case should also examine timing, interest, leasing costs, and exit assumptions.

Make the investment question explicit

State the decision the model supports: acquisition price, scenario selection, financing needs, or whether to fund further investigation. Attach a source, date, unit, and rationale to each important assumption. Review the model with qualified financial, tax, and design professionals. This educational example is not investment advice, an appraisal, a financing commitment, or a forecast of returns.