When should you start negotiating an office lease renewal?

Start 18 to 36 months before your lease expires. Renewal leverage comes from one thing: the landlord believing you can actually leave. At 30+ months out, relocation is fully credible and every alternative is open. Inside 12 months, typical office buildout plus permitting (6 to 12 months) starts eliminating those alternatives, and by 6 months the landlord knows you have nowhere else to go. In Denver's roughly 27% vacancy market on the major brokerages' Q2 2026 read (18.5% on the broader all-stock basis), starting early is the difference between capturing the concession window and watching it close on you.

Your leverage dies on a clock

Every renewal negotiation is really one question the landlord is asking: can this tenant actually leave?

Not "would they prefer to stay." Not "have they paid on time for ten years." Can they leave. If the honest answer is no, the landlord doesn't have to compete for you. They just have to wait.

Here's the part most occupiers miss. That answer isn't fixed. It changes with the calendar, and it only moves in one direction. At 30 months out, you can leave. At 6 months out, you almost certainly can't... and a landlord who has run this play a hundred times knows exactly where you sit on that clock.

Your tenure doesn't create leverage. Your payment history doesn't. The relationship doesn't. The credibility of your alternative does, and credibility is a function of time. I've watched two nearly identical Denver tenants land wildly different renewal packages for one reason: one started the conversation at 28 months, the other at 8.

So the real question isn't "what can I negotiate on a renewal." It's "how much negotiating power do I have left, given today's date."

The countdown: what each window is actually worth

30+ months out: you own every alternative

At two and a half years, everything is on the table. Relocation is fully credible because there's time to tour, negotiate, design, permit, and build anywhere in the metro. You can run the relocate-or-renew analysis as a genuine open question, not a bluff.

Your landlord knows this. Their leasing team models the probability of losing you, and at 30 months that probability is real. This is when landlords preemptively offer blend-and-extend deals, early renewals with real concessions, and rights you'll never see offered again... expansion options, termination options, caps on operating expense growth.

You don't have to sign anything at 30 months. You just have to start. The work at this stage is a lease abstract, a critical-date calendar, and a first read on the market.

18 to 24 months: the full market process window

This is the heart of the rule. At 18 to 24 months you can still run a complete, competitive process: engage a tenant rep, tour 4 to 6 credible alternatives, issue RFPs to competing landlords, and negotiate your renewal against live proposals instead of against nothing.

That competition is what converts market conditions into your economics. A landlord who knows you have two signed-ready alternatives prices your renewal like a new deal. A landlord who knows you have none prices it like a captive.

Every quarter you wait from here forward costs you three things at once:

• Concession leverage. Free rent, TI dollars, and rate all get negotiated against your alternatives. Fewer alternatives, thinner package.
• Option value. Renewal options, expansion rights, and termination rights are cheap for a landlord to grant when they're worried about losing you and expensive to buy when they're not.
• Moving feasibility. Second-generation space that fits you today gets leased to someone else while you wait. The set of buildings you could occupy shrinks every month.

12 months: the alternatives start thinning

At a year out, you can still move, but the math tightens. A typical office buildout plus permitting runs 6 to 12 months as a general range, before you add space selection and lease negotiation in front of it. Work backward and the runway is mostly gone for anything that needs real construction.

What's left: spec suites, move-in-ready second-generation space, and sublease space with a buildout you can live with. Those are real options in this market, but they're a subset... and your landlord can count.

This is also when renewal proposals start arriving that look reasonable and aren't. The landlord's opening number at 12 months assumes you didn't do the work at 24.

6 months: negotiating with no credible alternative

At six months, relocation to anything requiring construction is off the table, and both sides know it. You're negotiating on the landlord's read of your desperation, not on market comps. Even in a tenant-favorable market, captive tenants renew above market. The market data doesn't save you if you can't act on it.

Your remaining moves are narrow: a short-term extension to buy back runway, or taking the renewal you're offered. Neither is where you want to be.

3 months: a bad renewal or a holdover

At ninety days you're choosing between signing whatever is in front of you and holding over past your expiration date, which in most Denver office leases means 150% to 200% of your last rent, month to month, sometimes with liability for the landlord's damages. That's not a negotiation. That's triage.

The Denver market makes starting early cheaper than ever

Right now the countdown runs through the most tenant-favorable Denver office market of the cycle. Metro vacancy sits at a cycle high, roughly 27% on the major brokerages' basis (Q2 2026), and landlords are competing on roughly one month of free rent per year of term plus elevated TI allowances.

If you start at 24 months, that whole concession structure gets applied to your renewal, because your alternatives are real and your landlord is staring at vacancy in their own building and submarket. If you start at 6 months, the same market exists... you just can't reach it.

And the window is narrowing. Denver office is still in recovery, but Q2 marked a shift toward stabilization: tenants took roughly 119,700 SF more than they vacated, the market's strongest quarterly net absorption since Q1 2022's nearly 282,000 SF (Cushman & Wakefield), even with the year-to-date tally still slightly negative. Metro sublease availability has fallen five straight quarters to 3.9M SF. Even downtown, the softest corner of the market, now shows positive 12-month absorption on every basis: +157K SF on the broadest all-stock read (CoStar, July 2026). Only 708K SF is under construction, roughly 73% of it in Cherry Creek, and demolitions now outpace deliveries (CBRE, Q2 2026). The downtown sublease supply is burning off too. None of that flips the market tomorrow, but the direction is set: the shelves are emptying while demand recovers. A tenant who starts a 2028 expiration now negotiates in today's conditions. A tenant who waits negotiates in whatever 2028 looks like, with less time and fewer options.

One honest caveat: this is a metro average, and Cherry Creek is the exception. At 1.8% Class A vacancy with Class A rents near $68/SF (CBRE, Q2 2026), Cherry Creek is landlord-favorable, full stop. If your lease is there, the 18-36 month rule isn't early enough... start at 36 and treat every month as scarce, because your alternatives inside the submarket are genuinely limited.

Frequently asked questions

How far in advance should I start negotiating my office lease renewal?

Start 18 to 36 months before expiration. That window lets you run a real market process with credible relocation alternatives, which is what forces your landlord to compete. Inside 12 months, buildout and permitting timelines (typically 6 to 12 months) begin eliminating alternatives and your negotiating position weakens each quarter.

Is it too late to negotiate if my lease expires in less than 12 months?

No, but your playbook changes. With under a year, focus on move-in-ready space, spec suites, and sublease options as your alternatives, or negotiate a short-term extension to rebuild your runway. You'll still capture some of Denver's concession window at roughly 27% vacancy, just less of it than a tenant who started at 24 months.

What renewal concessions can Denver office tenants get right now?

Denver landlords are competing on roughly one month of free rent per year of term plus elevated tenant improvement allowances (SVN | Denver Commercial / CoStar, Q2 2026). Renewal tenants with credible alternatives can also negotiate rights that outlast the concessions: expansion options, termination options, and operating expense protections.

Does the 18-36 month rule apply in every Denver submarket?

The clock applies everywhere, but the market behind it doesn't. Most of the metro sits tenant-favorable at roughly 27% vacancy. Cherry Creek is the outlier at 1.8% Class A vacancy with Class A rents near $68/SF, which is landlord-favorable, so tenants there should start at the full 36 months and expect fewer alternatives inside the submarket.

What happens if my lease expires before I sign a renewal?

You go into holdover, and most Denver office leases price that at 150% to 200% of your final rent on a month-to-month basis, sometimes with exposure to the landlord's damages if they've committed the space to another tenant. Holdover is leverage for the landlord, not for you. Plan the timeline so it never becomes your only option.

The 18-36 month rule isn't about paperwork. It's about who has to compete for whom, and the calendar decides that before the first proposal is ever exchanged. Denver's concession window is real, and it's starting to narrow... which means the cheapest thing you can do about your renewal is start it now.

If your office lease expires anytime in the next 36 months, the clock is already running. Send me your lease and I'll build you a free lease abstract and critical-date timeline: your notice deadlines, your option windows, and the date your leverage starts to fade. No pitch, no obligation. Schedule a conversation.

About Brian McCririe
Brian McCririe is Executive Managing Director of SVN | Denver Commercial and National Council Chair for Occupier Services across the SVN network. After 25 years representing tenants and investors across global markets, he now focuses on the Denver Metro area helping companies navigate leases, acquisitions, and the gap between what landlords offer and what occupiers deserve. He leads one of the metro's top tenant rep practices and writes about the deals, decisions, and market shifts that matter to corporate real estate leaders.