Why this one ratio matters more than the asking price

Ask ten California restaurant buyers what number they check first, and most will say price or seller's discretionary earnings (SDE). The number that actually decides whether a deal survives its first bad month is the rent-to-sales ratio — rent (plus common area charges, if the lease has a NNN or NN structure) divided by gross annual sales.

A restaurant can have great food, loyal regulars, and a clean P&L, and still be a bad buy if the rent is eating too much of every dollar that comes in. Rent is fixed. Sales are not. When the ratio is already tight at the seller's current volume, there's no room left for a slow season, a construction detour outside, or a new competitor down the block.

The range brokers and lenders actually watch for

There's no single magic number — it varies by format — but the ranges most California lenders and operators work from are:

  • Under 8% — comfortable. Common for quick-service, counter-service, or high-volume concepts.
  • 8–10% — typical and workable for most full-service restaurants.
  • 10–12% — tight. Still financeable, but it leaves little cushion; expect a lender or buyer to ask hard questions.
  • Over 12% — a lease that's likely subsidizing the landlord more than the business. SBA lenders in particular will flag this, and it depresses the sale multiple even if current sales look fine.

These are typical ranges, not guarantees — a bar-driven concept with high liquor margins can carry a higher ratio than a thin-margin cafe at the same number.

What makes this ratio more useful than looking at rent in isolation is that it's relative. A restaurant's rent as a standalone dollar figure tells you little; the same rent against a small sales base versus a large one produces two very different businesses.

Why California runs hotter on this number than most states

Commercial rents in San Francisco, the Peninsula, and large swaths of Los Angeles and Orange County are structured around what a landlord believes the space could command, not necessarily what a restaurant tenant can sustainably pay. A few California-specific factors push the ratio higher than buyers coming from other states expect:

  • Percentage rent clauses. Many California retail and mixed-use leases include a base rent plus a percentage of gross sales above a breakpoint. Buyers sometimes calculate the ratio off base rent alone and miss the percentage component entirely — understating the true number.
  • NNN pass-throughs. Property tax (subject to Prop 13 reassessment triggers on transfer in some structures), insurance, and common area maintenance can add 15–25% on top of base rent. Skipping these in the calculation is the single most common mistake we see from first-time buyers.
  • Built-in annual increases. A 3–4% annual bump compounds. A ratio that looks fine in year one of a new term can look very different by year four if sales are flat.

How to calculate it correctly before you sign anything

  1. Pull the trailing twelve months of gross sales from POS reports, not the seller's summary P&L.
  2. Add up everything the lease requires: base rent, CAM, property tax pass-through, insurance pass-through, and — if applicable — percentage rent already paid in the trailing period.
  3. Divide total occupancy cost by trailing gross sales.
  4. Re-run the calculation using the rent at the end of the current lease term, not just today's rent, if there are scheduled increases.
  5. If the lease has a percentage rent clause, model what the ratio becomes if sales grow 10–20% — percentage rent means your rent grows with revenue, which changes how much upside actually reaches you.

This is exactly the kind of lease math we walk through with buyers during due diligence, alongside the ABC license and health permit review.

Red flags: when a low ratio is hiding a different problem

A ratio that looks healthy isn't automatically good news. Watch for:

  • Below-market rent about to expire. If a seller has an unusually low ratio because they signed a lease a decade ago, ask what happens at renewal. The ratio you're buying may not be the ratio you inherit.
  • Reported sales that don't match deposits. A low ratio built on inflated reported revenue evaporates once you verify against bank statements — a step covered in our bulk sale escrow guide.
  • A landlord unwilling to assign on the same terms. The ratio is meaningless if the lease doesn't transfer to you intact. Confirm assignability in writing before you anchor your offer to the current rent figure.

Where this fits in your overall offer

Rent-to-sales ratio shouldn't be the only test you run, but it's one of the fastest ways to sanity-check a listing before you spend time and money on full due diligence. If a concept is being marketed on strong SDE but the ratio is already above 12% with scheduled increases ahead, that SDE has a shelf life.

If you're evaluating a California restaurant purchase and want a second set of eyes on the lease math before you make an offer, browse current listings or reach out through the buyer form and we'll walk through the occupancy cost together.

FAQ

Is rent-to-sales ratio the same as the "10% rule" I've heard about?

Close. The common shorthand is that rent shouldn't exceed about 10% of gross sales for a typical full-service restaurant. It's a useful rule of thumb, but it ignores format differences — a QSR concept can run well under that, while a high-end bar program can sometimes carry more.

Should I use gross sales or net sales?

Gross sales, before any discounts or comps are netted out in the seller's internal reporting, matched to what's on the POS and bank deposits. Using a net figure artificially improves the ratio.

What if the lease doesn't disclose CAM charges clearly?

Ask the landlord directly for the trailing 12 months of actual CAM and tax pass-through billed to the tenant. Don't rely on an estimate in the lease — actual billed amounts are what matters.

Does this ratio apply to leases with percentage rent only, no base rent?

Yes — total all percentage rent paid over the trailing period and divide by sales the same way. These leases tend to keep the ratio more stable as sales change, which is itself worth knowing before you buy.

Where should this fit in my offer timeline?

Run it before you write an LOI, not after. It's a five-minute calculation once you have the lease and trailing sales, and it can save weeks of due diligence on a deal that was never going to work.