# Writing an investment thesis that can be disproved

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Markdown: https://chicagocommercialfunding.com/guides/writing-an-investment-thesis-that-can-be-disproved/index.md
Resource ID: writing-an-investment-thesis-that-can-be-disproved
Published: 2026-10-21
Updated: 2026-10-21
Attribution: Chicago Commercial Funding Editorial
Topic: strategy
Asset types: All commercial
Investment stage: Evaluate
Experience level: Intermediate

A useful investment thesis names the tenant need, property advantage, funded actions, expected cash, evidence, and conditions that would make the investor reject or change the plan.

An investment thesis is a testable explanation of why a particular commercial property can produce an acceptable return at its complete cost. It should state what must be true, how the investor will establish that, what actions create value, how much capital is required, and what evidence would cause rejection. A statement that Chicago is a strong market is background, not a property thesis.

The purpose is disciplined decision making before attachment to a deal. A good thesis can fail. It can also survive a difficult quarter when its core evidence remains intact and the investor has funded the transition. The investor needs to distinguish a challenged assumption from a temporary fluctuation instead of rewriting the story after every result.

## Separate a narrative from a mechanism

A narrative might say that a retail property benefits from neighborhood activity. A mechanism explains which tenants need the premises, why those tenants prefer it to alternatives, what rent and recoveries they can support, what the landlord must deliver, and how those terms become owner cash.

Name the current problem and proposed change. Examples include recovering valid lease expenses, reducing avoidable vacancy through improved delivery, renewing a strong tenant before rollover, or upgrading power for a documented industrial requirement. Each has different evidence and capital needs.

Avoid making appreciation the only mechanism. A higher future price can contribute to return, but it needs a supported explanation and a downside where pricing does not improve. The investor should know whether operations, lease economics, capital work, debt reduction, or market repricing produces the modeled result.

## Begin with a sentence that can be challenged

For a hypothetical small retail center, a useful thesis might be: qualified local-service tenants need these suite sizes and access; a defined $400,000 program can deliver the premises; supported effective rents and recoveries can produce $90,000 additional stabilized NOI; and the investor can fund the transition within eighteen months.

Every component invites a question. Which tenants and alternatives? What scope and cost evidence? Are recoveries enforceable? When does rent begin? What happens if delivery takes longer? The claim is useful because it can be investigated and disproved before the investment becomes unconditional.

A weak version would say the area is improving and rents should rise. It gives no capital requirement, timing, counterfactual, or rejection threshold. The investor could declare success or make excuses under almost any outcome.

## Use Chicago research as context, then narrow it

Colliers' Chicago midyear 2026 retail report, published August 5, describes stable fundamentals and interest in experiential and service-oriented tenants, alongside selective leasing and repositioning of obsolete big-box locations. That is a dated market observation, not proof of demand for the hypothetical center. [Colliers Chicago retail, midyear 2026](https://www.colliers.com/en/research/chicago/chicago-retail-market-report-2026-q2)

The thesis should therefore test the specific tenant category, premises, trade area, competition, use rights, access, infrastructure, and total occupancy cost. A desirable general trend can be irrelevant to a suite that cannot support the intended use or requires uneconomic landlord work.

Do not substitute a city or suburb name for a causal explanation. A location matters when its economics, regulation, labor, customers, transport, infrastructure, or competitive supply changes the tenant and owner decision. Define that difference with evidence rather than repeat a market slogan.

## Build an evidence ladder

Classify support by its actual strength: executed contract, documented collection, verified physical capacity, completed professional report, signed proposal, observed competing transaction, public research, interview judgment, or untested assumption. These categories are not interchangeable.

An executed lease supports contractual terms but does not remove credit risk. A tour indicates interest but is not a tenant commitment. A utility estimate is different from installed, usable service. A proposed development does not establish the delivery date of competing supply.

Keep the original record, date, source, limitation, and underwriting effect. An evidence table should explain which assumption it supports and which uncertainty remains. A long source list that never affects the investment model is less useful than a concise set of records tied to specific decisions.

## Translate the thesis into a balanced funding plan

For the retail illustration, assume $400,000 physical work, $100,000 leasing capital, and $100,000 transition liquidity. The identified incremental commitment is $600,000. If stabilized NOI increases $90,000, the simple incremental yield is 15% before financing, timing, taxes, further capital, and other effects.

That calculation does not establish the acquisition's complete return. The purchase price, fees, debt, existing cash, reserves, and exit still matter. It simply connects the claimed operating benefit with its identified implementation cost instead of treating the NOI gain as free.

Build a monthly schedule showing when each dollar is paid and when new rent is collected. A plan requiring $600,000 before the tenant starts cannot be funded by the tenant's later rent unless an actual capital source bridges the interval.

## Define the downside before negotiating price

Assume the incremental plan costs $750,000 and produces only $50,000 additional NOI. The corresponding simplified yield is approximately 6.67%, before the same excluded items. The difference from the base is both more capital and less recurring income.

Set an explicit condition that would change approval. For example, an investor might require independent support for at least a stated income benefit, a maximum delivered cost, committed liquidity, or a minimum complete return under a relevant stress. The thresholds are the investor's judgments, not universal market rules.

A price adjustment can rescue some failed assumptions but not every physical or legal constraint. A building lacking a feasible intended use cannot necessarily become a good version of that plan merely because the purchase price falls. Compare alternative uses and exit options separately.

## Make financing conditional on the same evidence

State the debt structure, accepted income, reserves, guarantees, payment schedule, maturity, and takeout assumptions. A loan based on current cash differs from a loan contingent on future leasing. The thesis must fund the conditions needed to obtain the proposed capital.

OCC guidance provides primary commercial underwriting context for market conditions, feasibility, repayment, and structure. It reinforces the need for a coherent payment and exit source, rather than assume that collateral or a positive market narrative justifies the loan. [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)

Test the income and value available at maturity. A three-year business plan does not solve a two-year balloon without an executable bridge. Include the capital required if the permanent lender accepts less income or a different valuation than the investment model.

## Use contradictory evidence honestly

A thesis becomes stronger through a fair attempt to reject it. Ask a person not invested in the acquisition to identify unsupported links, missing costs, unavailable rights, weak tenant evidence, and timing contradictions. Record the response and correction rather than dismiss it as excessive conservatism.

CBRE's Q3 2026 suburban-office report records both positive net absorption and 27.9% direct vacancy. The coexistence illustrates why one improving measure does not establish that a particular office building faces limited competition. Use the dated evidence to ask sharper questions about the subject, not to declare a uniform recovery. [CBRE Chicago suburban office, Q3 2026](https://www.cbre.com/insights/figures/chicago-suburban-office-figures-q3-2026)

Define what would distinguish a temporary setback from a failed mechanism. A delayed but enforceable tenant commencement with funded scope differs from repeated lost prospects because the building cannot meet their requirements. The first may require time and liquidity; the second may require a different plan.

## Assign actions and decision rights

For each critical assumption, name the person responsible for verification, the evidence required, deadline, cost, and decision if it fails. Complete expensive or irreversible commitments only after the appropriate conditions are satisfied under the actual contracts.

Identify who can approve a budget increase, lease concession, financing change, capital call, or sale. An operating team cannot assume investor approval for unlimited support. The thesis should describe the authorized business plan and the process for revising it.

Track milestones that create cash rather than activity alone. Tours, proposals, and construction meetings are useful leading indicators, but possession, completed work, enforceable rent commencement, collections, and accepted lender income are different milestones. The model should recognize their actual timing.

## Preserve the original thesis during ownership

Keep the approval version, its evidence, calculations, and conditions. Update actual results beside it rather than replace the original with a new explanation every quarter. Distinguish deliberate changes from errors and external developments.

Review whether the mechanism still works and whether the next capital dollar is justified. Past spending is not a reason to keep pursuing an invalid assumption. Conversely, a funded and supported plan should not be abandoned simply because a broad headline changes while the subject evidence remains intact.

The final thesis should tell an investor what the property needs to do, why that outcome is plausible, what it costs, how it is financed, and when to stop or change course. It is a decision instrument that connects evidence with capital, not an optimistic description written after the purchase.

## A condition is useful only when it changes an action

Assume the investor's approved program requires the $600,000 incremental commitment to remain within its funded limit. A contractor later identifies another $120,000 of necessary scope, while leasing evidence supports only the original $90,000 NOI benefit. The simplified incremental yield falls from 15% to 12.5% before the same excluded items. The team should identify whether repricing, reduced scope, different tenant delivery, new capital, or rejection is appropriate under the actual contracts.

The initial thesis has not become useless because the number changed. It has done its job by exposing the decision. Record why the revised plan meets or fails the owner's required complete return and liquidity limits. If the investor changes those limits, identify that as a new judgment rather than claim the original condition was satisfied.

## Source registry

- [Colliers — Chicago retail midyear 2026](https://www.colliers.com/en/research/chicago/chicago-retail-market-report-2026-q2): accessed 2026-10-21
- [CBRE — Chicago Suburban Office Figures Q3 2026](https://www.cbre.com/insights/figures/chicago-suburban-office-figures-q3-2026): 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

- [A Chicago commercial investor’s guide to investment strategy](https://chicagocommercialfunding.com/learn/strategy/)
- [Choosing comparable properties that actually compete](https://chicagocommercialfunding.com/guides/choosing-comparable-properties-that-actually-compete/)
- [Evaluating transit freight and infrastructure in a property thesis](https://chicagocommercialfunding.com/guides/evaluating-transit-freight-and-infrastructure-in-a-property-thesis/)