Let me say something that gets me strange looks at closings: the cap rate is the least interesting number on the page. It’s the one everybody leads with, but it’s a photograph of a single day. What you actually own isn’t a cap rate. You own a set of relationships with the people writing you rent checks. That’s the asset. Everything else is packaging.
Here’s the trap. A building trades at a 6 cap and the buyer feels good about it. But that number assumes the income holds. It assumes the tenant stays, keeps paying, and renews. Cross out any one of those assumptions and your “6 cap” becomes fiction. A vacant building has no cap rate at all. It just has expenses and a mortgage.
The rent roll is the story; the cap rate is the headline
When I look at a deal in Oakland, Concord, Fremont, or anywhere along the I-680 corridor, the first thing I want is the rent roll and the leases, not the marketing flyer. Because that’s where the real questions live:
- Lease quality. Is this a strong national credit tenant or a handshake and a hope? Are there personal guarantees? How’s the escalation structure? A flat lease and a bumping lease are two different animals wearing the same coat.
- Tenant health. Is the business actually making money in that space, or are they one bad quarter from handing you the keys? A tenant who’s thriving renews. A tenant who’s drowning becomes your problem.
- Rollover risk. When do the leases expire, and do they all expire at once? A building where every tenant rolls in the same 18 months isn’t stabilized income. It’s a cliff with a nice view.
Below-market rent cuts both ways
People love to hear “the rents are below market.” Sometimes that’s real upside. Sometimes it’s the only reason the tenant is still there. A tenant paying under-market rent is a tenant with a reason to renew. Push them to market too hard, too fast, and you may discover that the rent was the relationship. This is why I don’t get excited about spread alone. I want to know why the gap exists and what happens when you try to close it.
Warren Buffett said it best: “When the tide goes out, you can see who has been swimming naked.” Rising rates and softer demand have been the tide going out for a couple of years now. The owners who feel it least aren’t the ones who bought at the sharpest cap rate. They’re the ones with good tenants on good leases who keep paying no matter what the headlines say. Durable income is boring right up until the moment it’s the only thing that matters.
What I’d actually stress-test
If I’m advising you on a hold or a purchase in Alameda or Contra Costa County, here’s the exercise I’d run before I ever glanced at the asking cap rate:
- Map every lease expiration on a timeline. Where’s the concentration?
- Ask what it costs and how long it takes to backfill each space if that tenant walks.
- Look at whether the in-place rents are defensible if you had to re-lease tomorrow.
- Be honest about tenant credit, not hopeful about it.
Do that, and the cap rate stops being a promise and starts being what it actually is: one input among many. Buy the income stream, not the headline number.
When’s the last time you actually read your own leases cover to cover? If it’s been a while, that might be the most valuable hour you spend this quarter. Want a second set of eyes on your rent roll? Reach out.
