Measure backfill time from a clearly defined starting event to a clearly defined cash event. Possession, lease execution, delivery, occupancy, and first base rent are different milestones. An investor should model each interval and the costs incurred before the replacement becomes reliably cash-producing.
Begin the analysis while the incumbent still occupies the space. Early inspection, document review, design, marketing, and renewal discussions can expose problems before the rent stops. They do not guarantee an immediate replacement, but they make the plan and funding more credible.
Define four clocks
The possession clock tracks when the owner can inspect, alter, and deliver the premises. The marketing clock tracks when a qualified prospect can become an executed lease. The delivery clock tracks design, permits, procurement, construction, systems, and required approvals. The cash clock tracks concessions and the first collectible payments.
These clocks overlap only when the lease, physical access, project scope, and market permit it. A model that adds every stage sequentially can overstate delay, while a model that assumes all stages overlap can be equally misleading.
Use a dependency schedule. For each milestone, record the earliest achievable date, expected date, downside date, responsible person, and evidence. Keep projected milestones distinct from completed ones.
Hypothetical six-month forecast that becomes nine
Assume an industrial tenant leaves June 30. The owner expects to sign a replacement by September 30, complete work by November 30, and collect full base rent from January 1 after one free month. Base rent is $12,000 monthly, and vacant operating carry is $3,000 monthly.
The original forecast has six months without base rent from July through December. Suppose negotiations instead take two more months and required equipment adds another month to delivery. Full base rent moves to April 1, creating nine months without base rent.
| Incremental effect of three additional months | Amount |
|---|---|
| Additional foregone base rent versus forecast | $36,000 |
| Additional vacant carry | $9,000 |
| Cash deterioration before financing and other effects | $45,000 |
The three-month delay can also affect debt service, tax payments, and refinance timing. Those belong in the property model. If the original schedule already includes free rent, do not subtract the same concession twice.
The example uses hypothetical dates and costs, not a claim about current Chicago industrial leasing time. Replace them with actual evidence for the subject space.
Start with possession and surrender condition
Review the incumbent’s expiration, options, holdover terms, access rights, removal duties, and required condition. Counsel should interpret when the owner can obtain and work in the space. Do not assume the marketing team can promise delivery before possession is secure.
Inspect through the rights the lease provides. Determine equipment ownership, restoration, abandoned items, utilities, and possible environmental or other specialized diligence. A premises turnover can reveal conditions hidden by the former operation.
Keep expected tenant restoration recoveries separate from the owner’s immediate project budget. A claim against a departing tenant may be valid yet slow to collect. The next lease still needs funding.
Investigate the next user’s physical needs
A replacement business may need different power, loading, ventilation, HVAC zoning, plumbing, access, parking, or layout. The existing tenant’s successful operation does not establish suitability for another use.
Price a defined scope. Separate demolition, base-building repair, tenant improvements, design, permits, project management, utility work, contingency, and commissioning. Identify work that must be complete before marketing can support a credible delivery date.
For a Chicago-area property, obtain the correct municipal and parcel-specific review. City and suburban processes can differ, and a prior use does not automatically establish a new use’s permissions. Avoid using an unsupported universal permit duration.
Model lease execution separately from rent commencement
A prospect can become a signed lease before all conditions are met. Identify contingencies, landlord work, tenant work, approvals, commencement definitions, and free rent. The owner should know what remains between signature and cash.
A public filed lease ties commencement to readiness and addresses delivery and tenant delay. It is a concrete example of why an estimated start date and an achieved milestone are different. Filed commencement conditions.
Use the actual contract when updating the forecast. A new outside date, concession, or work-letter change can shift several months of receipts even if the face rent is unchanged. Report those changes immediately.
Build a credible leasing pipeline
Ask the broker to identify competing spaces, target users, asking and achieved economics where supportable, and the reasons the subject space will be chosen. A list of inquiries is not the same as qualified demand.
Track prospect stages: inquiry, tour, financial review, proposal, negotiation, documents, execution, and conditions satisfied. Define those stages consistently. Avoid counting one prospect multiple times through affiliated entities or repeated tours.
Record the reason a prospect declines. Repeated feedback about condition, utility capacity, parking, or price may justify a change in the business plan. A schedule should adapt to evidence rather than preserve an arbitrary acquisition assumption.
Separate committed cost from cash paid
A signed lease can commit the owner to allowances and commissions before invoices arrive. Show total commitment, paid-to-date, cost to complete, and cash timing. A low current cash-spend figure does not establish a low future funding requirement.
Empire State Realty Trust’s original filing distinguishes leasing costs presented for signed leases from the periods when cash is actually paid. The analytical lesson is to preserve both commitments and payment timing; its portfolio amounts are not a local cost benchmark. ESRT filing.
Forecast allowance payments, contractor draws, commissions, and tenant contributions at the expected months. Identify reimbursement lags and lender conditions. Calculate the maximum cumulative deficit and available sources to cover it.
Estimate cost by outcome rather than a single allowance
Prepare renewal, as-is replacement, full-buildout replacement, and slower-leasing cases where relevant. Each can have different costs and timing. A specialized tenant may justify higher rent but require more capital and approvals.
Public office-owner reporting separates new and renewal leasing costs, supporting the distinction between outcomes. Use the source to understand categories and definitions, not to import its figures into a small local building. Hudson Pacific leasing-cost disclosure.
If the estimate is preliminary, show a range and the next evidence needed. A contractor walk-through is different from a priced design, and a priced design can still change. The contingency should match that uncertainty and the owner’s capacity.
Vacant carry continues even under net leases
Include taxes, insurance suitable for actual occupancy, utilities needed to protect the premises, security, snow and landscape services, inspections, and maintenance. Confirm coverage and technical requirements with professionals.
Expense recoveries may fall when a tenant leaves. Other tenants do not automatically absorb the missing share. Read their agreements before shifting cost. A full building budget with a reduced reimbursement line is often clearer than hiding vacancy effects in a rent-only adjustment.
Overlay debt payments and owner-level obligations. Positive cash flow from other suites can fund the vacancy, but show that use explicitly. It reduces available distributions and can leave less protection for another event.
Test the financing exit under delay
If refinancing depends on the replacement, ask how the lender treats signed but uncommenced leases, free rent, tenant credit, and remaining work. A delayed rent start can lower proceeds or defer the transaction while interest continues.
Review loan maturity, extension conditions, reserves, and leasing approvals. A forecast should not assume an automatic extension or unrestricted access to lender-controlled funds. Have the financing team explain the actual terms.
Prepare a fallback with additional equity, a different leasing scope, a slower capital program where feasible, or another supported strategy. The strongest stabilized value is irrelevant if the owner cannot fund the path to it.
Use leading indicators after vacancy begins
Monitor qualified tours, proposals, reasons for rejection, scope completion, approval status, procurement, and committed funds. Tie those indicators to changes in the expected cash date. Reporting only occupancy can leave the owner unaware that the forecast is slipping.
Reforecast at defined milestones and when material evidence changes. Preserve prior forecasts so ownership can distinguish a one-time surprise from a systematically optimistic assumption. Use actual outcomes to improve future acquisition underwriting.
Before approving a major concession, compare its value with the cost of continued vacancy. A concession may accelerate cash and reduce uncertainty, but the comparison needs the full effective-rent and credit analysis. Do not accept any tenant merely to improve a reported occupancy percentage.
A backfill plan an investor can rely on
The final plan should state when possession is expected, what work is required, who the likely users are, what evidence supports pricing and timing, when cash begins, and how the maximum deficit is funded. Identify unresolved legal, physical, and demand questions.
A vacancy becomes manageable when the owner has useful real estate, realistic execution assumptions, and adequate capital. Measuring the separate clocks before the tenant leaves turns a generic downtime allowance into an operating plan that can be monitored and adjusted.
Retain both the originally approved schedule and the current forecast. The difference shows how much contingency has been consumed and what decisions remain available; replacing the original dates without a bridge can conceal a deteriorating funding position.