Walk through enough properties and you start to notice something strange: the deals people regret are rarely the ones that looked bad on paper. They’re the ones that felt right. Good light in the kitchen. A street with mature trees. A view that makes you imagine yourself living there. Emotion shows up early in a property search, and it tends to arrive long before the spreadsheet does.
That sequence is backwards, and it’s expensive. A property is not a lifestyle decision unless you’re going to live in it. If you’re buying it as an investment, it’s a small business — one with revenue, expenses, debt service, maintenance obligations, and a tax bill. It should be evaluated like one.
What Running Businesses Taught Me About Buying Property
My background is in sales, business development and call-center operations — building teams, managing customer acquisition, and living with the consequences of operational decisions. I’m Garrett O’Rourke, President of Commercial Development Group, based in Miami Beach, and I invest privately in real estate and public markets.
Running a business teaches you that the headline number is almost never the real number. Anyone can quote you a revenue figure. The question is what’s left after payroll, rent, software, turnover, training, and the customer who doesn’t pay on time. Operators learn to be suspicious of gross figures because they’ve been burned by the gap between gross and net.
Real estate works exactly the same way. The rent figure is the gross. Everything that happens between that figure and what actually lands in your account is where the investment is won or lost — and it’s the part most people estimate optimistically.
Over the years I’ve come to think of property evaluation as a discipline of subtraction. Start with what the asset can plausibly produce, then subtract relentlessly and honestly. If it still works after you’ve been hard on it, you might have something. If it only works when you’re generous with your assumptions, you don’t have an investment. You have a hope.
Why Buyers Skip the Math
There are a few reasons emotion beats arithmetic so consistently.
Property is tangible. You can stand in it. You can touch the countertops. A stock is an abstraction; a house is a physical thing your brain wants to own. That tangibility makes property feel safer than it is.
The story is culturally pre-approved. Everyone has heard that real estate always goes up, that they’re not making more land, that rent is money thrown away. These are slogans, not analysis. Some markets have gone sideways for years. Some buyers have paid carrying costs on an appreciating asset and still lost money because the carry ate the gain.
Competition creates urgency. In active markets — and South Florida has seen plenty of active periods — the fear of losing a property to another buyer does more damage than any single line item in the budget. Urgency is the enemy of underwriting. When you’re responsible for a team, you learn quickly that decisions made under artificial time pressure are the ones you re-explain later.
Optimism compounds quietly. Nudge the rent up a little. Assume vacancy will be lower than average. Assume the roof has a few more years in it. Assume taxes stay flat. Each assumption is defensible alone. Stacked together, they turn a marginal deal into a great one on paper and a problem in reality.
Evaluating a Property Like a Business
Here’s the framework I actually use. It isn’t sophisticated. Its value is that it’s boring and repeatable, which is the same reason a good sales process works.
1. Underwrite the income conservatively
Find out what comparable units actually rent for right now — not what the listing suggests they could rent for after improvements. Then build in vacancy. Tenants move out. Units sit. Turnovers cost money in cleaning, paint, and lost weeks. A property that only works at full occupancy every month of the year isn’t a property that works.
2. List every carrying cost, including the ones nobody quotes you
- Mortgage principal and interest
- Property taxes — and how reassessment might change them after your purchase
- Insurance, which in coastal markets deserves its own serious research rather than a placeholder estimate
- HOA or condo association fees, plus the possibility of special assessments
- Utilities you’ll be responsible for
- Property management, whether you pay someone or pay yourself in time
- Routine maintenance and a reserve for capital items — roof, HVAC, water heater, plumbing
That last one is where amateurs and operators separate. Capital expenses don’t show up monthly, so they’re easy to leave out. But a roof has a lifespan, and every year you own the property you’re consuming part of it. Reserve for it or it will arrive as a surprise.
3. Treat appreciation as a bonus, not a premise
Appreciation potential is real, and location drives a lot of it — proximity to employment, transit, schools, coastline, and the direction of local development. But appreciation is a forecast, and forecasts are not cash flow. If the deal requires the market to rise for you to come out ahead, you’re not investing in a property. You’re making a bet on a market and using a property as the vehicle.
4. Model the downside before you model the upside
What happens if it sits empty for three months? If insurance jumps meaningfully at renewal? If rates change before you refinance? If you need to sell in a soft market? As an investor, I’d rather know the shape of the bad outcome in advance than discover it while I’m living through it. Risk isn’t a reason to avoid real estate — it’s the thing you’re being paid to manage.
5. Know your number before you walk in
Negotiation gets easier when the math is done. If you’ve decided in advance what a property is worth to you, the conversation becomes simple: the price works or it doesn’t. Walking away is a normal outcome, not a failure. Most of the properties I’ve looked at closely, I didn’t buy. That’s not indecision. That’s the filter working.
Numbers First, Then Instinct
None of this means judgment doesn’t matter. It does. Experience tells you which neighborhoods feel like they’re on the way up, which buildings are well run, which sellers are motivated and which are fishing. That kind of read is genuinely valuable — and it’s earned by looking at a lot of properties over a long stretch of time.
But instinct should come after the arithmetic, not instead of it. Numbers narrow the field to deals that can work. Judgment picks among them. Reverse the order and you’ll talk yourself into a property because you liked how it felt on a Sunday afternoon.
Patience is the part that’s hardest to teach. There’s always another property. The discipline is in waiting until the math and the instinct agree, then acting decisively when they do. In my experience, the investors who do well in real estate aren’t the ones who move fastest. They’re the ones who’ve decided in advance what they’re willing to accept, and don’t renegotiate with themselves in the parking lot.
A property is a business. Underwrite it like one, respect the downside, and let the numbers speak before the emotion does.
This reflects my own perspective as a private investor and business operator. It isn’t individualized financial advice — every market, property and personal situation is different, and worth evaluating with professionals who know your specific circumstances.
Photo by Jörg Reichelt on Unsplash