A deal can look attractive in a broker package and still fail the moment you test the assumptions. That is why commercial underwriting process steps matter: they turn an asking price, a rent roll, and a trailing financial statement into a decision you can explain to a lender, partner, or client.
For most small to mid-sized CRE operators, speed matters. But speed without a repeatable process creates false confidence. The goal is not to build the most complicated model possible. It is to identify what drives value, determine whether the numbers support the story, and understand where the deal breaks before you spend weeks chasing it.
Start With a Fast Deal Screen
The first pass should answer one question: is this opportunity worth deeper work? Before entering every lease or expense line, review the asset type, location, asking price, current net operating income, occupancy, in-place rents, debt assumptions, and proposed business plan.
Calculate a few initial indicators: price per unit or square foot, in-place cap rate, debt service coverage ratio, and a rough cash-on-cash return. Compare them against recent transactions, your target returns, and the property’s submarket. A low cap rate is not automatically a problem if rents are meaningfully below market and the path to growth is credible. Conversely, a high cap rate may reflect deferred maintenance, tenant concentration, weak demand, or an expense issue that is not obvious in the offering materials.
This screen is also where you define the deal thesis in plain language. For example, the property may be under-rented, operationally inefficient, poorly managed, or positioned to benefit from a local demand driver. If you cannot state the thesis clearly, you are not ready to model the upside.
Gather the Source Documents Before Building the Model
Good underwriting begins with source quality. A model cannot correct incomplete, outdated, or inconsistent information. Request the trailing 12-month operating statement, current rent roll, historical financials, leases for major tenants, tax bills, utility data, capital expenditure history, and any available inspection or environmental reports.
For multifamily, verify unit counts, lease expiration dates, concessions, delinquency, loss-to-lease, employee units, and down units. For retail, office, or industrial, pay particular attention to tenant rollover, lease terms, renewal options, reimbursements, rent escalations, tenant credit, and vacancy exposure.
Do not assume the rent roll ties to the income statement. It often does not. Differences may be legitimate, such as recent move-ins or timing issues, but they need an explanation. When documents conflict, flag the discrepancy instead of quietly choosing the more favorable number.
Commercial Underwriting Process Steps for Revenue
Revenue is where optimistic underwriting most often starts. Build from what exists today, then model what is reasonably achievable. Separate in-place rent from market rent and identify the timing required to capture any increase.
For an apartment property, begin with physical occupancy and economic occupancy. Physical occupancy tells you how many units are occupied. Economic occupancy shows what the owner is actually collecting after vacancy, concessions, bad debt, and delinquency. A property reporting 95% occupancy may still be underperforming if concessions and collections issues are significant.
Next, test market rent assumptions against comparable properties. The right comparison is not simply the newest asset with the highest advertised rent. Consider unit size, finish level, amenities, parking, location, concessions, and actual achieved rents. If your projected rents require renovations, include realistic renovation costs, downtime, and lease-up timing.
Commercial assets require a similar discipline, but the income analysis centers on leases. Review each tenant’s contractual rent, renewal probability, expiration date, expense reimbursements, and options. A building with strong current income can become a very different investment if 40% of its revenue expires within two years.
Use conservative timing. Rent growth may occur, but rarely all at once. Lease expirations, renovation schedules, market absorption, and local competition determine when projected income can actually reach the model.
Normalize Expenses Instead of Copying Them
Historical expenses are evidence, not a forecast. Some costs are fixed or relatively predictable, while others need to be normalized based on operations, market standards, and the condition of the property.
Review each major expense category: payroll, repairs and maintenance, utilities, insurance, property taxes, management fees, marketing, administrative costs, and reserves. Look for one-time items, deferred expenses, owner-specific costs, and expenses that may rise after acquisition.
Property taxes deserve special attention. In many jurisdictions, a sale triggers reassessment. Underwriting taxes from the seller’s historical bill can make a deal appear stronger than it is. Insurance is another common blind spot, particularly for properties in regions facing severe weather, wildfire, flood exposure, or rapidly changing carrier requirements.
For multifamily, compare expenses on a per-unit basis to similar properties. For other commercial property types, per-square-foot analysis can be more useful. A low expense ratio might signal operational efficiency, but it can also indicate that repairs, payroll, or capital needs have been deferred.
Separate Operating Expenses From Capital Needs
Net operating income is not the same as cash flow. Operating expenses keep the property functioning day to day. Capital expenditures address larger replacements and improvements such as roofs, HVAC systems, parking lots, plumbing, elevators, unit turns, or major renovations.
A seller may show a healthy NOI while postponing expensive work. That does not mean the work disappears after closing. Build a capital plan that distinguishes immediate repairs, recurring reserves, and value-add improvements. Then align the timing of those costs with your financing and business plan.
This distinction also protects your investment committee narrative. If a projected return depends on spending $1 million on improvements, show where that capital comes from and when it is deployed. Do not bury it in a generic reserve line.
Model Financing and Test the Exit
Debt can improve returns, but it can also turn a manageable underwriting error into a serious problem. Model the actual proposed loan structure, including the interest rate, amortization period, term, interest-only period, fees, reserves, and prepayment provisions.
Then test debt service coverage and debt yield against lender expectations. A deal with thin coverage may still be financeable, but it leaves little room for rent growth delays, higher expenses, or a leasing setback. Floating-rate debt requires an even more deliberate stress test because the cost of capital can change quickly.
Your exit should be conservative enough to survive scrutiny. Apply an exit cap rate that reflects the asset’s likely condition, market outlook, lease profile, and remaining growth potential at sale. It is usually prudent to underwrite an exit cap rate above the entry cap rate, especially when the business plan depends on market growth.
The exit is not a guess about where the market will be. It is a test of whether the investment still works if the market is less favorable than your base case.
Run Sensitivities Before You Trust the Returns
A base case tells you what happens if your assumptions are right. Sensitivity analysis tells you how exposed the deal is when they are not. Test the variables that matter most: rent growth, vacancy, renovation pace, operating expenses, interest rates, exit cap rate, and sale timing.
You do not need dozens of scenarios. A practical approach is to run a downside case, a base case, and an upside case. The downside case should be plausible, not catastrophic. If modest changes to rent growth or exit cap rate erase the return, the deal may be too dependent on favorable conditions.
Pay attention to the break-even points. How much occupancy can decline before debt service coverage becomes uncomfortable? How far can the exit cap rate expand before the equity multiple no longer meets your target? Those answers are often more useful than the headline IRR.
Document Assumptions and Make the Decision
The final step is not formatting the model. It is documenting the assumptions that drive the result and identifying what must be verified during due diligence. Keep a short assumptions log that shows the source, rationale, and confidence level for major inputs.
This makes conversations with partners, lenders, and clients more productive. Instead of arguing about whether a return is right, you can focus on the few inputs that truly determine the outcome: achievable rent, tax reassessment, renovation scope, tenant renewal, or financing terms.
A strong underwriting process does not eliminate uncertainty. It gives uncertainty a place in the model, makes risk visible early, and helps you decide whether to pursue the deal, renegotiate the price, or walk away with confidence.
Leave a Reply