# How buyers re-underwrite leases cash flow and capital needs

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Markdown: https://chicagocommercialfunding.com/guides/how-buyers-re-underwrite-leases-cash-flow-and-capital-needs/index.md
Resource ID: how-buyers-re-underwrite-leases-cash-flow-and-capital-needs
Published: 2026-10-21
Updated: 2026-10-21
Attribution: Chicago Commercial Funding Editorial
Topic: exit
Asset types: All commercial
Investment stage: Exit
Experience level: Intermediate

A commercial buyer reconstructs recurring income and future cash from leases, collections, expenses, capital, and financing rather than accept the seller’s advertised NOI.

Commercial buyers re-underwrite because the seller's reported income is not necessarily the cash a new owner will receive. Different leases, expense conventions, collection assumptions, capital needs, financing, and timing can produce very different investment outcomes from the same building. A useful seller package helps a buyer reproduce the figures while leaving room for justified disagreement.

The buyer's task is not to lower every assumption automatically. It is to identify what is contractual, what is recurring, what remains uncertain, and how much capital is needed before owners receive cash. A conservative-looking model can still be wrong if it applies arbitrary discounts without understanding the property.

## Begin with contractual revenue and actual collections

Abstract every material lease and amendment. Record premises, commencement, rent steps, concessions, recovery provisions, expiration, options, termination rights, guarantees, deposits, assignment rules, and landlord obligations. Check the actual documents against the rent roll.

A rent roll is a summary rather than the agreement itself. A tenant billed $25,000 monthly may have an enforceable credit, unexpired free rent, disputed recovery, or delinquent balance. Reconcile billed rent with collections and tenant correspondence before deciding whether the amount is durable income.

Separate base rent, recoveries, percentage rent, parking, storage, and other revenue. Each source has its own evidence and risk. Counting recoveries without the corresponding reimbursable expenses overstates NOI; deducting all property expense while omitting valid recoveries understates it.

For mixed-use assets, residential and commercial schedules should remain separate until consolidation. Their lease rules, demand, concessions, recovery rights, and capital requirements differ. An average rent growth rate across both streams can conceal the actual investment problem.

## Rebuild recurring operating expenses

Start with historical invoices and contracts rather than a percentage of purchase price. Investigate taxes, insurance, utilities, maintenance, payroll, service contracts, management, administrative costs, and recurring landlord obligations. Identify expenses missing because the seller self-managed or a system was neglected.

Separate accrual economics from cash timing. An annual insurance premium paid in one month can distort a short-period statement. An unpaid tax bill can make cash expenses look low while creating a closing obligation. Keep both the normalized expense and the payment calendar.

Fannie Mae's income guidance provides a primary example of documented multifamily income analysis and reconciliation. It is program-specific; its treatment should not be imposed on a retail or office property without examining the applicable lease and lender context. [Fannie Mae income analysis](https://mfguide.fanniemae.com/node/7531)

Do not assume every lender and investor uses the same NOI or NCF definition. The buyer should state whether replacement provisions have already been deducted before applying coverage tests or subtracting reserves again. Reconcile the actual loan's definitions rather than infer them from a familiar acronym.

## A hypothetical seller-to-buyer bridge

Assume a seller presents the following annual property figures:

| Item | Seller presentation | Buyer adjustment | Buyer result |
|---|---:|---:|---:|
| Base and other income | $700,000 | ($30,000) collection adjustment | $670,000 |
| Recoveries | $100,000 | ($20,000) unsupported amounts | $80,000 |
| Operating expenses | ($300,000) | ($40,000) recurring costs | ($340,000) |
| NOI before separate capital | $500,000 | ($90,000) | $410,000 |

All figures are hypothetical. The buyer must support the $30,000 collection change, identify the recovery clauses and expense schedules behind $20,000, and document the $40,000 recurring cost. Labels such as conservative or market do not substitute for that evidence.

At a hypothetical 8% cap, $500,000 suggests $6,250,000 gross value; $410,000 suggests $5,125,000. The $1,125,000 difference follows from the $90,000 NOI change divided by 8%. It does not mean the buyer's assumptions are automatically correct or that 8% is a current Chicago market cap rate.

The negotiation should focus on the underlying income and costs. Splitting the price difference mechanically can still leave both parties relying on incompatible property facts.

## Capital is the next bridge, not an afterthought

Assume the buyer's $410,000 NOI is before $30,000 recurring replacements, $120,000 one-time roof work, and $80,000 leasing capital. If annual debt service is $220,000, cash after all those first-year items is negative $40,000:

$410,000 − $30,000 − $120,000 − $80,000 − $220,000 = negative $40,000.

If the roof and leasing accounts are funded at acquisition, they belong in initial sources and uses and their later payments should not be charged again as an unfunded contribution. Either presentation can explain the investment if it reconciles correctly. Hiding the items entirely cannot.

STAG Industrial's annual filing provides a primary real-world example of commercial industrial leasing and capital matters requiring analysis beyond an operating-income headline. Its portfolio figures are not a budget for this hypothetical property. [STAG Industrial 2025 annual report](https://s23.q4cdn.com/763235638/files/doc_financials/2025/ar/Final-2025-Annual-Report-STAG.pdf)

## Translate lease rollover into a dated cash plan

A lease expiring in eighteen months is not simply a long-term average vacancy percentage. Model the actual tenant, area, current rent, likely options, downtime, new rent, free rent, improvements, commission, and expense carry. Separate renewal and replacement cases.

Renewal probability is an assumption rather than a contractual right unless the documents establish otherwise. A tenant expressing interest is different from an executed binding agreement. A signed agreement can still have delivery conditions before rent starts.

Check whether an above-market lease increases current cash while leaving a future decline. A below-market lease may offer upside only if the owner can lawfully and practically reset it. Neither description alone proves the investment is attractive at the price.

Identify concentrations by rent, recoveries, expiration, industry, corporate group, and physical dependency. Multiple suites occupied by related businesses may represent one credit exposure. One anchor can affect other tenants' rights and demand even when its own rent share appears modest.

## Financing can amplify a modest disagreement

A lower accepted NOI can reduce proceeds through coverage or debt-yield constraints. It can also reduce valuation and therefore LTV sizing. Calculate each constraint on the lender's stated basis and use the binding result rather than select the largest number.

OCC guidance emphasizes repayment analysis, collateral, loan structure, and documented underwriting. It supports examining the income and obligations together, rather than assuming an attractive capitalization rate establishes debt capacity. [OCC CRE handbook](https://www.occ.treas.gov/publications-and-resources/publications/comptrollers-handbook/files/commercial-real-estate-lending/pub-ch-commercial-real-estate.pdf)

Maintain a requested-versus-accepted schedule. Each lender adjustment should have a reason, source, and effect on proceeds. A seller may provide better evidence that resolves an adjustment; a buyer may discover a new condition requiring more equity. Financing certainty improves when those differences are addressed before the last closing week.

## Re-underwrite the exit with the same discipline

Use a defined terminal income period and actual lease dates. A final-year statement can include rent that disappears immediately after the sale. Project forward obligations and remaining capital instead of applying a cap to an unexplained stabilized figure.

Deduct selling costs and the actual projected loan payoff, then return only unused reserves. Distinguish property-level cash from ownership allocation, taxes, and sponsor compensation. A gross value increase can coexist with a weak equity return after funded work and debt.

The buyer's conclusion should be a reproducible investment decision: supported price, complete equity need, financing, base cash, downside contribution, exit assumptions, and conditions that could reverse approval. The seller's most useful response is specific evidence, a clear correction, or an appropriately priced unresolved risk. An advertised NOI becomes credible through that reconciliation, not through repetition in marketing material.

## Compare renewal and replacement on equal terms

Assume a hypothetical 10,000-square-foot tenant can renew at $20 annual rent for five years. A competing replacement proposal offers $24, but requires a year of vacancy, $300,000 improvements, and $60,000 commission. Ignore escalation, recoveries, operating cost differences, taxes, and discounting only for this first comparison.

Renewal produces $200,000 annual rent, or $1,000,000 over five years, before any renewal costs. Replacement produces no rent in year one and $240,000 in each of the following four years, or $960,000 total. After the identified $360,000 initial leasing costs, replacement leaves $600,000 before the excluded items. The higher face rent does not win this five-year undiscounted comparison.

If renewal instead requires $100,000 work and $20,000 commission, its corresponding amount becomes $880,000. It still exceeds the simplified replacement amount by $280,000. A longer holding horizon or different exit valuation might change the result, but that requires an explicit model rather than a claim that higher rent creates more value.

Next incorporate actual rent commencement, free rent, reimbursements, operating expenses during vacancy, renewal credit, replacement credit, and time value. Project the lease's remaining term at sale. An exit buyer may price near-term rollover differently even when the holding-period cash appears attractive.

This comparison also explains why a buyer can disagree with the seller's highest-and-best-rent assumption without assuming the property is undesirable. The buyer may prefer a lower-risk renewal with a stronger net contribution. Conversely, a weak incumbent, obsolete use, or materially inadequate rent can justify replacement when full economics support it.

Keep the analysis tied to actual contractual rights. A buyer cannot force a renewal, reject an enforceable option, or reset a rent simply because the spreadsheet prefers that outcome. The decision framework is to compare available alternatives, identify conditions, and fund the preferred path. It does not create rights missing from the lease.

## Source registry

- [Fannie Mae — Income analysis](https://mfguide.fanniemae.com/node/7531): accessed 2026-10-21
- [STAG Industrial — 2025 annual report](https://s23.q4cdn.com/763235638/files/doc_financials/2025/ar/Final-2025-Annual-Report-STAG.pdf): accessed 2026-10-21
- [OCC — Commercial Real Estate Lending handbook](https://www.occ.treas.gov/publications-and-resources/publications/comptrollers-handbook/files/commercial-real-estate-lending/pub-ch-commercial-real-estate.pdf): accessed 2026-10-21

## Related resources

- [Commercial property exit planning disposition and distress](https://chicagocommercialfunding.com/learn/exit/)
- [How capital expenditures change cash flow without changing NOI](https://chicagocommercialfunding.com/guides/how-capital-expenditures-change-cash-flow-without-changing-noi/)
- [1031 exchanges timelines intermediaries and execution risk](https://chicagocommercialfunding.com/guides/1031-exchanges-timelines-intermediaries-and-execution-risk/)