Rent Commencement vs. Lease Commencement Dates: The Net-Lease Gap That Costs Buyers

What it is

Lease commencement is the date the lease legally starts and the tenant takes possession. Rent commencement is the date the tenant actually starts paying rent. They're often not the same day, and the gap between them is where a lot of buyers get surprised.

How it plays out in retail net lease

Here's how I look at it. When a retail tenant signs a new build-to-suit or takes a space that needs work, the lease usually "commences" well before a single dollar of rent shows up. The tenant needs time to build out the store, install fixtures, get permits, and open the doors. During that window — call it the buildout or free-rent period — the clock on the lease is running, but rent isn't.

So you get a lease that says, for example, the term commenced in January, but rent doesn't commence until, say, six months later when the store opens. Both dates are real. They just answer different questions.

Why should you care as a buyer? Because most of what you're paying for keys off one of these dates, and it's easy to grab the wrong one.

The mistake I see buyers make is treating the lease commencement date as the start of their income. It isn't. If you close during that early window, you may be buying a property where rent hasn't started yet — and unless the seller is crediting you, that's a gap you eat. On the flip side, the lease expiration and your remaining term are usually measured from lease commencement, not rent commencement. So the two dates pull in different directions, and you need both.

What to watch for

• The gap length. A 30-day gap is noise. A six-to-twelve-month buildout gap is real money and real term to account for.
• Which date drives rent bumps and options. Scheduled increases and renewal windows can be tied to either date. Read the actual clause — don't assume.
• A commencement date that's still "to be determined." On a brand-new lease, rent commencement is sometimes defined by an event (store opening) rather than a fixed calendar date. That's an open item, not a detail.
• Rent commencement certificates. Many leases require a signed memo confirming the actual dates once the tenant opens. If it exists, get it. If it doesn't, ask why.
• Free rent or abatement periods after opening. Rent can "commence" and still be discounted or abated for a few months. Commencement doesn't always mean full rent.
• Estoppels that don't match the lease. The tenant's estoppel certificate should confirm both dates. When it conflicts with the lease, that conflict is your job to resolve before closing.

How to use it to your advantage

Once you separate the two dates, you can price the deal honestly. Calculate your remaining term off lease commencement so you know how much runway you're really buying. Then calculate your actual cash flow off rent commencement so you're not projecting income you won't collect yet.

If there's a gap between closing and rent commencement, that's a negotiation. You can ask the seller for a rent credit at closing to cover the shortfall, or adjust your price for it. Sellers marketing off a full-rent number sometimes gloss over a buildout period that hasn't ended — quiet, factual questions here tend to pay for themselves.

I also use these dates to sanity-check the broker's stated cap rate. A cap rate built on rent that hasn't commenced yet is a projection, not a return. Knowing the difference keeps you from overpaying for a promise.

Best case, worst case

Best case:

• Rent has already commenced, the store is open and operating, and both dates are documented in a signed rent commencement certificate.
• Your remaining-term math and your cash-flow math line up, with no gap to fund at closing.

Worst case:

• You close during an unfunded buildout window, assume rent is flowing, and discover you're carrying the property with no income for months.
• The dates in the lease, the estoppel, and the seller's marketing don't agree, and nobody flagged it until after closing.

The fix in both cases is the same: read both dates yourself, confirm them in the estoppel, and price the gap before you sign.

This article is general education, not investment, tax, or legal advice. Verify every detail independently against the actual lease documents and your own advisors before acting.