Today, I'm going to walk you through commercial real estate underwriting, and more importantly, I'm going to show you why it matters. Not just how to plug numbers into a spreadsheet, but why each piece of the puzzle actually affects your decision to buy or pass on a deal.
I've been doing this since 2013, and I can tell you that the difference between investors who succeed and investors who lose their shirts comes down to one thing: they know how to underwrite. So let's break this down using a real deal that's actively on the market right now, a KFC triple net lease here in Nashville.
What Is Commercial Real Estate Underwriting (And Why Should You Care)?
If you're coming from residential real estate, you might think analyzing a deal means checking the Zestimate and running some quick math on rental income. Commercial real estate underwriting is a completely different animal.
When you underwrite a commercial deal, you're building a financial model that accounts for purchase costs, financing structure, the rent roll, operating expenses, tax benefits, and your exit strategy. It tells you whether a deal pencils based on the returns you're targeting, not just whether it "feels" like a good investment.
If you've been following my channel, you know I did a 30 Deals in 30 Days underwriting challenge last fall where I went live and underwrote a deal every single day. If you haven't watched those, go check out the playlist on my YouTube channel. It'll show you the full process of how I pull information together and actually run the numbers.
And by the way, I've got a free commercial underwriting spreadsheet that you can download. It's the same one I use. You can grab my deal analysis toolkit here. But today I'm using the tool we built for members of the CRE Accelerator to make things a little simpler.
Breaking Down a Real NNN Lease: A KFC in Nashville
Here's the deal we're looking at. It's a single-tenant KFC, absolute triple net lease, actively for sale in the Nashville market. Here are the basics:
Building size: 4,549 square feet
Built: 2005, renovated 2009
Purchase price: $3,396,000
Lease remaining: 19 years
Annual rent bumps: 1.5%
NOI: $195,288 ($42.93 per square foot)
Cap rate: 5.75%
Now, if you don't fully understand what cap rates mean in commercial real estate, go read that guide first. But here's the short version: the cap rate tells you the return you'd get if you paid all cash. At 5.75%, this is a relatively low return, which is typical for credit-tenant triple net deals.
Because this is an absolute net lease, the underwriting is actually pretty straightforward. The tenant (KFC) pays for everything: taxes, insurance, maintenance. My operating expenses are essentially zero. That's the beauty of NNN investing, but it also means the returns are more modest.
The Financing Changes Everything
Here's where it gets interesting. I assumed 30% down, a 6.75% interest rate, and a 10-year loan term. No lender holdback, no interest-only period, no refinance scenario. This isn't a value-add play. It's basically buying a bond that's backed by commercial property with the credit of KFC behind it.
My target? An 8% annualized cash-on-cash return and a 12% IRR. That 12% might sound low to you, and honestly, it is from my perspective. I typically do value-add deals where I'm targeting much higher returns. But for a completely passive, hands-off investment? It's reasonable.
Here's what the underwriting told me: this deal doesn't pencil at $3.396 million. To hit those return targets, I'd need to pay $1.7 million max. That's a massive gap.
And the year one cash flow? Negative $16,000. I'm actually losing money the first year just to carry the mortgage.
But Wait, Look at the Tax Benefits
Now, before you write this deal off entirely, here's where understanding commercial real estate tax benefits becomes critical.
I ran a cost segregation study on this deal. At a 37% tax bracket, my estimated tax savings in year one is $198,000. So yes, I'm losing $16,000 in cash flow, but I'm getting $198,000 back on my taxes. And my loan balance drops about $100,000 from principal paydown between year one and year two.
For $17,000 out of pocket, I'm getting $198,000 in tax savings plus $100,000 in equity paydown. That's the kind of math that makes experienced investors pay attention, especially if you're sitting on a 1031 exchange and need to place capital somewhere.
Stress Testing: What Actually Makes This Deal Work?
Here's the real power of CRE underwriting. Once you have your model built, you can start pulling levers to see what works.
At the asking price of $3.396 million, my projected IRR at a 10-year exit is only about 6%. Not attractive. But then I start asking questions:
What if I drop the price to $3 million? Still only a 9.2% IRR. Better, but not where I want to be.
What about the debt service coverage ratio? At the asking price, I'm at a 1.05x DSCR. I can tell you right now, without even picking up the phone, a lender is not going to fund this deal. They're going to want at least 1.25x.
So what does that mean? I need to bring more cash. At 60% LTV instead of 70%, I get to a 1.22x DSCR in year one, hitting 1.24x in year two and 1.26x in year three. A lender might work with me on that given the credit of KFC and a brand new 19-year lease. And now I'm looking at $35,815 in positive cash flow that first year.
See how this works? The underwriting doesn't just tell you "good deal" or "bad deal." It shows you exactly which levers to pull to make it work, or confirms that it simply can't work at any reasonable terms.
Why Every Investor Needs to Understand This Process
Look, I get it. Plugging numbers into a spreadsheet isn't the sexiest part of commercial real estate investing. But here's why this matters so much.
If you're the sole investor, you need to know whether a deal is worth your time and money before you make an offer. The underwriting tells you exactly that. And if you're buying your first commercial property, having a solid underwriting process is what separates you from the people who overpay.
If you're raising capital, you need to take this to investors and lenders. You need to show them your purchase costs, your financing, your rent roll, your operating expenses, your tax benefits, and your exit assumptions. You need a stress test that shows a bear case, a base case, and a bull case. Sophisticated investors expect this. Lenders require it.
And here's the thing most people miss: the more you underwrite, the faster you'll recognize good deals. I recommend going through this process every single day. Pull up a deal on Crexi. Run the numbers. You don't have to be serious about buying it. But the practice of going through it teaches you what works and what doesn't in your specific market.
After underwriting this KFC deal, here's what I learned in 15 minutes: a 5.75% cap rate with 6.75% debt isn't going to produce strong cash flow returns. But the tax benefits through cost segregation are substantial, and for a passive, hands-off investment (especially in a 1031 exchange), a 9.2% IRR over 15 years might actually be worth it compared to the risk and effort of a value-add deal.
That's the power of understanding commercial real estate at a deeper level.
Key Takeaways
Underwriting tells you the "why," not just the "what." It's not about plugging in numbers. It's about understanding which levers you can pull to make a deal work.
Always check the DSCR before approaching a lender. If your debt service coverage ratio is below 1.25x, you're going to need to restructure the deal.
Don't ignore tax benefits. Cost segregation can turn a deal that looks marginal on cash flow into a strong performer when you factor in depreciation savings.
Practice every single day. The more deals you underwrite, the faster you'll spot opportunities, and you'll know instantly when something doesn't pencil.
Know your target returns before you start. Your IRR target, your cash-on-cash target, and your exit assumptions should all be defined before you open the spreadsheet.
This article is adapted from a live episode on the Tyler Cauble YouTube channel.
Want to learn how to underwrite deals like a pro? Book a call to learn about the CRE Accelerator, my step-by-step program for building your commercial real estate portfolio. And don't forget to grab your free deal analysis toolkit to start practicing today.