NOI-first underwriting for a retail lease, the CCIM way: build net operating income line by line before you talk about price, value or a cap rate.
Photo: Alex Reynolds / Unsplash
Most retail deals I see go sideways in the same place: someone settled on a price before anyone built the income. I learned the opposite habit as an investment advisor with a national investment brokerage in St. Louis, and the CCIM curriculum turned it into a discipline. Start with net operating income. Everything else is downstream.
This article walks through how I underwrite a single retail lease, NOI first, whether I am advising an owner, an investor or a tenant who wants to understand the landlord's side of the table.
What is NOI-first underwriting?
Net operating income is what a property produces after vacancy and operating expenses, before debt service and income taxes. NOI-first underwriting means you build that number from the source documents, line by line, before you discuss price, value or a cap rate.
The reason is simple arithmetic. Value is NOI divided by a cap rate. If the NOI is overstated by ten percent, the value is overstated by ten percent, no matter how carefully anyone argued about the cap rate.
NOI also leaves out things that matter to an owner but not to the property: the loan, depreciation and the owner's income tax situation. Those are real, but they belong to the investor, not the building. Keeping them out of NOI is what lets you compare two properties fairly.
How do you build NOI from a retail lease?
I use the same order every time, because the order catches mistakes.
- Scheduled base rent, taken from the lease itself, including the escalation schedule, not from a one-line rent roll.
- Expense recoveries: what the tenant reimburses for taxes, insurance and common area maintenance under the actual lease language.
- Other income: signage, percentage rent or anything else the lease or property really produces.
- Vacancy and credit loss: an allowance for downtime and for tenants who do not pay, even on a fully leased property.
- Operating expenses: taxes, insurance, CAM, management, repairs and reserves, whether or not they are recovered.
- Net operating income: effective gross income minus operating expenses.
Here is the same order in the NOI calculator, with round, illustrative inputs you can change.
- Effective gross income
- $294,500
- Net operating income
- $224,500
- Expense ratio
- 23.77%
NOI = (scheduled rent + other income) × (1 − vacancy) − operating expenses. Debt service and capital costs are not operating expenses. The example figures are illustrative, not the terms of any property.
Open the full calculator →Worked by hand, in the order I teach it: potential gross income is $310,000. A 5% vacancy and credit allowance takes off $15,500, leaving $294,500 of effective gross income. Subtract $70,000 of operating expenses and the NOI is $224,500. Change one input at a time and watch the bottom line. Vacancy and expenses usually surprise people more than rent does.
Why underwrite the lease before the price?
Because the lease is the asset. A retail building without leases is a box with a tax bill. The lease decides who pays for the roof, who absorbs a tax increase, when rent steps up and whether a tenant can leave early.
When I review a deal, I read the leases before I read the offering memorandum. The memorandum tells you what the seller hopes the income is. The lease tells you what the income legally is.
Once the NOI holds up, we can have a disciplined conversation about cap rates. Andrew Danner, Windfield's owner and broker, wrote a clear piece on how he reads a cap rate on a small neighborhood center, and it is the natural next step after this one.
Once your NOI is solid, read how Andrew Danner reads a cap rate on a neighborhood center.
Which lease terms move NOI the most?
- Expense structure. Gross, modified gross and NNN leases put operating costs in different hands, and that changes NOI directly.
- Escalations. A fixed annual step, a CPI clause or flat rent produce very different income five years out.
- Remaining term and options. A short remaining term means re-leasing risk; renewal options at fixed rents can cap the upside.
- Co-tenancy and kick-out clauses. These let a tenant reduce rent or leave if other conditions fail, and they belong in the vacancy line.
- Expense caps. A cap on controllable CAM shifts cost overruns back to the owner.
- Tenant credit. A local operator and a national brand can sign identical rent and carry very different risk.
How does this apply at The Shops at Smithville?
The Shops at Smithville, at 14903–14901 U.S. 169 north of Kansas City, is a 30,150 SF center that Windfield is leasing now. The committed tenants so far are a pizza shop, AT&T, a nail salon, an HVAC company and an accountant. That is a service-driven mix, and it shapes the rest of the leasing.
There are 18,680 SF available in four spaces: Suite 400 at 1,400 SF, Suite 500 at 2,100 SF, Suite 600 at 5,180 SF, which is the largest in-line suite, and the standalone 14901 South Building at 10,000 SF.
If you are a tenant considering one of those spaces, NOI-first thinking works on your own business too. Build your expected revenue, subtract your total occupancy cost and operating costs, and see what is left before you fall in love with a floor plan.
Review the site plan, the brochure and the four available spaces at The Shops at Smithville.
What underwriting mistakes do I see most often?
- Using asking rent instead of signed rent.
- Leaving out vacancy because the building is full today.
- Counting reimbursements as income without counting the expense they reimburse.
- Skipping reserves for roofs, parking lots and HVAC.
- Reading the rent roll and never opening the lease.
None of these are exotic. They are habits, and better habits are what the CCIM designation is really about.
How do you stress-test an NOI?
Once I have a base case, I break it on purpose. I raise vacancy, lower rent at renewal, add a year of downtime on the largest tenant and push up the expenses the lease does not let the owner recover. If the property still works under those changes, the NOI is sturdy. If one tenant leaving would erase the margin, that tells you more about risk than any cap rate will.
I also check the NOI against the property's history where there is one. Two or three years of operating statements, set next to the current leases, show whether the expense line is realistic and whether recoveries actually get collected. A new center has no history, so the lease terms and the budget carry even more weight there.
Running an accounting, insurance or other professional practice? See how the Smithville suites fit an office-style service tenant.
If you want a second set of eyes on a lease or an income statement, I am glad to walk through the math with you. You can reach me through Windfield Real Estate at 816-612-5191.
Talk through a lease or an underwriting question with Ben Nelson, CCIM.
Questions people ask
What is the difference between NOI and cash flow?
NOI is income after vacancy and operating expenses but before debt service and income taxes. Cash flow subtracts loan payments from NOI. Two buyers can look at the same building and see the same NOI but very different cash flow, because their financing is different. That is why NOI is the cleaner way to compare one property with another.
Does a NNN lease mean the owner has no expenses?
No. Under a NNN lease the tenant generally reimburses taxes, insurance and common area maintenance, but the owner often still carries structural items, roof replacement, vacancy periods, non-recoverable costs and management time. Read the lease to see exactly which costs are recoverable, and underwrite the ones that are not.
Why include vacancy on a fully leased property?
Because leases end, tenants close and renewals take time. A fully leased center today will have downtime at some point, and an underwriting that assumes none will overstate NOI. The size of the allowance is a judgment based on lease terms, tenant credit and the property itself, and it should be stated plainly so everyone can test it.
Is the CCIM method different from how lenders underwrite?
The logic is the same: build NOI from the leases and expenses, then test it. Lenders often apply their own vacancy and reserve assumptions and size the loan from the result. Starting from the same NOI framework means fewer surprises when the appraisal and the lender's numbers come back.
Can a retail tenant use NOI-first thinking?
Yes. A tenant's version is a simple business budget: expected revenue, minus cost of goods, payroll, other operating costs and total occupancy cost. If the business only works at a rent lower than the space is offered at, it is better to know that before signing than after opening.
Ben is a Certified Commercial Investment Member (CCIM) who advises clients on leasing, acquisitions and investment analysis. Before joining Windfield in 2020 he advised investors in St. Louis and worked in leasing and property management in Columbia, Missouri.
Windfield Real Estate, LLC · Licensed Missouri real estate broker · 816-612-5191 · info@windfieldrealestate.com
