Commercial lease-up is the transition from available space to collectible income after delivery, concessions, operating costs, and financing. A signed-area target alone does not define stabilization. Build a suite-level monthly cash schedule and state what stabilized means for the owner, lender, and exit buyer.
The budget should show how much capital is needed before rent begins, how much expense remains unrecovered, how leasing costs are paid, and what happens if the transition is slower or more expensive. Regional absorption can inform demand research, but it is not the subject property’s automatic lease-up speed.
Separate the milestones
Track qualified requirement, proposal, executed lease, landlord work, possession, tenant work, opening, rent commencement, collections, and lender acceptance. These events can occur on different dates. A completed building can remain vacant, and a signed lease can require substantial work before income begins.
Define occupancy measures explicitly. Physically occupied area, leased area, paying area, economic occupancy, and collected income are not interchangeable. Free rent and delinquency can weaken cash while the headline leased percentage rises.
State the lender’s actual stabilization or conversion tests separately from the investor’s targets. A property meeting a forecasted annual NOI may still lack required operating history, documents, completed work, or accepted collections. Confirm conditions before treating a permanent takeout as available.
Forecast by suite or tenant cohort
For each space, identify area, use, delivery condition, target tenant, supported rent, recovery rights, downtime, allowance, commission, concessions, expected signing, and commencement. Separate current contracts from speculative terms. Keep a confidence and evidence column.
Research tenant alternatives and the property’s functional requirements. The market for large logistics buildings does not automatically establish demand for small bays, and a medical buildout is not an interchangeable office finish. The initial scope should reflect the tenant the building can realistically attract.
CBRE’s August 2026 Chicago midyear review provides dated market context, including industrial leasing and the size of active tenant requirements within its stated universe. It does not establish the subject’s monthly absorption, concession, or landlord cost. Match the cohort and verify property-level demand. CBRE Chicago midyear review, August 2026
A hypothetical three-suite sequence
Assume three equal 10,000-square-foot suites and $20 annual base rent per square foot. Each suite would pay $200,000 annually or approximately $16,666.67 monthly after commencement. Ignore recoveries and escalation only for this first illustration.
Suite A starts paying in month four, B in month seven, and C in month ten. Paying months in the first year are nine, six, and three respectively. Base rent totals $150,000 plus $100,000 plus $50,000, or $300,000. Multiplying full annual rent of $600,000 by year-end 100% leased occupancy would overstate first-year collections by $300,000.
If each suite requires $100,000 landlord work and $20,000 commission, initial leasing investment is $360,000. Identify payment dates and whether those amounts are already funded in sources and uses. If funded, their later payment consumes the capital account; it is not a second unfunded contribution.
These are hypothetical rents, terms, costs, and dates. They are not Chicago asking or effective-rent evidence. An actual model must also account for credit, concessions, possession conditions, expenses, recoveries, taxes, and debt.
Reconcile recoveries during the transition
Read each lease’s expense obligations, commencement, exclusions, caps, allocation, and payment process. A future NNN arrangement does not reimburse vacancy expense before a paying tenant is obligated. The owner may carry taxes, insurance, utilities, maintenance, and other costs throughout delivery and free rent.
Determine whether recoveries start with possession, opening, base rent, or another contractual event. Do not assume all revenue starts on the same date. Reconcile recovery income with the underlying reimbursable expenses and avoid double charging.
Forecast actual shared costs and vacant-space responsibilities. A partially leased building can have nearly full fixed expenses plus incremental delivery and management. Dividing a stabilized expense ratio by leased occupancy can misrepresent the transition.
Compare concessions through net cash
Higher face rent can require more free rent, allowance, commission, or base-building delivery. Compare complete dated cash and the remaining lease at exit, not the rent headline. A renewal and new lease may have different downtime and cost profiles.
STAG’s full-year 2025 operating-portfolio leasing table reports different new-versus-renewal commissions and improvements, illustrating why those categories should be separated. The company’s reported figures are portfolio evidence, not a Chicago construction or first-generation leasing budget. Read its stated scope before comparison. STAG 2025 leasing results
A real acquisition should support concessions with relevant premises and tenant requirements. Do not borrow a public company’s average simply because it appears precise. Its size, geography, assets, tenant mix, and reporting universe can differ materially from the subject.
Define stabilization through recurring cash
Specify the income period, paying occupancy, collection history, recurring operating costs, remaining capital, and evidence. A final-month run rate annualized can be useful if labeled, but it may not capture seasonal expense, concessions, delinquency, or near-term lease events.
Separate the owner’s business-plan milestone from the lender’s accepted measure. A lender can adjust rent, vacancy, expenses, reserves, and debt service under its own documents. Use its actual definitions and approval conditions rather than a generic stabilized NOI label.
An exit buyer may also examine the durability of recently signed rents and unperformed obligations. Preserve the lease, delivery, collection, capital, and expense records needed to explain the transition. A leasing percentage alone cannot support the complete valuation.
Fund monthly deficits and interest
Combine suite-level cash with operating expenses, capital payments, debt, reserve deposits, interest reserve use, and eligible draws. Identify the maximum cumulative deficit and the cash available at that date. Annual positive results can conceal an earlier payment shortage.
If financing reimburses costs after inspection, include owner bridge cash. If tenant allowances are paid after milestones, map the actual sequence. Do not assume nominal reserve balances can be used for every cost when loan restrictions allocate them differently.
OCC guidance supplies primary commercial construction and income-property context for feasibility, market conditions, disbursements, and repayment. The investor should connect leasing assumptions with an executable funding and exit plan. OCC CRE handbook
Stress timing and economics separately
In the three-suite example, delaying every commencement by three months reduces first-year paying months to six, three, and zero. Base rent becomes $100,000 plus $50,000, or $150,000. That is $150,000 below the original first-year $300,000 before any offsetting expenses or changed recoveries.
Now test lower rent or higher delivery separately. If achieved rent falls 10% after the same dates, annualized full base rent falls from $600,000 to $540,000. If landlord work rises $50,000 per suite, capital increases $150,000. A complete combined downside should include all selected changes explicitly.
The delay can also increase interest and carry and postpone permanent-loan acceptance. Do not count the $150,000 lost rent as the entire funding effect if other accounts change. Update the monthly reserve and maturity schedule.
Use leasing checkpoints to control capital
Set decisions before major speculative delivery, tenant-specific work, and further commitment. Evidence can include qualified demand, executable terms, tenant credit, approved scope, funded capital, and required consents. A condition should lead to an action if not met.
Compare a smaller scope, different suite configuration, revised tenant target, repricing, or continued vacancy only where feasible and lawful. Each alternative needs its own cost, rent, and schedule. Do not combine the cheapest delivery with a tenant requiring the most expensive fit-out.
Track prospects and reasons for rejection. Repeated objections to power, loading, layout, access, or delivery can indicate a functional mismatch rather than a need for more marketing. A revised plan may require renewed investor and lender approval.
Report the transition honestly
Maintain a monthly table of available, signed, possessed, paying, and collected space; scheduled and actual rent; concessions; recoveries; leasing commitments; completed delivery; capital paid; reserve burn; and takeout readiness. Explain variances through actual causes.
Update the forecast when evidence changes without erasing the original approval. Owners should know whether the next capital dollar still advances a supportable plan and whether the remaining liquidity covers a relevant downside.
A successful lease-up budget turns tenant demand into funded delivery and recurring collections. It is useful because it identifies the cash and time required before the building can support its debt, owner distributions, and exit value.
Read the public leasing table’s exclusions
The cited STAG full-year 2025 table separately reports new-lease commissions of $2.30 per square foot and renewal commissions of $1.17. Its accompanying note excludes value-add and first-generation leasing from that operating-portfolio table. This is a specific issuer disclosure, not a Chicago rate schedule. It demonstrates why a development budget should not import a mature portfolio average without examining scope, lease category, timing, and excluded activity.
The same discipline applies to the investor’s own reporting. In the hypothetical three-suite example, year-end paying occupancy reaches 100%, while first-year base collections are only $300,000 against a $600,000 full-year potential. That is 50% on this explicitly stated rent-only annual collection basis, not a universal economic-occupancy definition. Keep the dates and denominator visible so a strong year-end leasing result does not conceal the cash used to reach it.
Use actual commencement and collection dates beside every stabilization claim.