A renewal option gives a tenant the right to extend its lease on terms set years ago. When the market has moved since signing, those terms can be worth a lot to one side or the other.
Two things decide how much: how the clause sets the new rent, and whether the tenant gives notice inside the window. This article covers both, with the math for a hypothetical flex lease.
What a renewal option is
A renewal option is a right, not a duty. The tenant may extend the lease for a stated term, such as five years, by giving written notice on time. If it does, the landlord is bound to the terms the option sets. If notice is late, the option may be lost.
Options can carry conditions. The tenant may need to be current on rent and not in default, both on the notice date and on the start of the new term. Whether a given condition is met is a question for your attorney; a lease abstract simply records it.
Three ways an option sets rent
Renewal clauses tend to set the new rent in one of three ways:
- A fixed rent. The lease names the number, such as $19.00 per square foot. Simple, and a bet by both sides on where the market will be.
- A step from the last rent. The new rent is the final year’s rent plus a stated increase, such as 3%.
- Fair market rent. The new rent is set by the market at the time, sometimes as a percentage of it, such as 95%, and sometimes with a floor, such as not less than the final year’s rent.
A fair market clause should also say how the rent is fixed if the parties disagree. Some name a process: each side picks a broker or appraiser, and a third decides between them. Read that part as carefully as the rent.
What “market rent” means here
Fair market rent sounds like one number. In a lease, it is whatever the clause defines, and the definitions vary.
Questions the clause should answer:
- Market rent for what: new leases, renewals or both?
- For which space: same building, same submarket, same size and condition?
- On what basis: net, modified gross or gross?
- Counting concessions or not: free rent, improvement allowances, commissions?
- As of what date: the notice date or the start of the new term?
The concessions question is the one that moves money. A landlord offering new tenants three months of free rent is charging less than the face rent suggests.
Face rent and effective rent
Face rent is the number in the lease. Effective rent is what the landlord actually receives over the term, after concessions:
Effective rent = (face rent over the term, less concessions) ÷ years
Say new five-year leases for similar flex space are signing at $16.00 per square foot with three months free:
$16.00 × 5 years = $80.00 per square foot
Three months free = $4.00 per square foot
($80.00 less $4.00) ÷ 5 = $15.20 effective
Same space, two defensible market rents: $16.00 face and $15.20 effective. Which one the option uses depends on the clause.
A worked example
The numbers here are illustrative. Say a business leases 4,000 square feet of flex space in Fort Collins at $14.50 per square foot, net. The lease expires June 30, 2028. It has one five-year renewal option at 95% of fair market rent, but not less than the final year’s rent.
The landlord’s letter puts fair market rent at $17.00, citing asking rents nearby. A market rent benchmark finds new leases at $16.00 face with three months free, as above. Three readings follow:
| Reading of the clause | Market rent | At 95% | Option rent |
|---|---|---|---|
| Landlord’s asking-rent view | $17.00 | $16.15 | $16.15 |
| Signed face rents | $16.00 | $15.20 | $15.20 |
| Effective rents, concessions counted | $15.20 | $14.44 | $14.50 (the floor) |
The spread between the top and bottom readings is $1.65 per square foot:
$1.65 × 4,000 square feet = $6,600 a year, or $33,000 over five years
Now price the alternative. Say moving and building out comparable space would cost $55,000, spread over a new five-year lease:
$55,000 ÷ 5 years ÷ 4,000 square feet = $2.75 per square foot a year
$15.20 effective + $2.75 = $17.95
So moving would put this tenant at about $17.95 per square foot a year, before downtime and disruption. Exercising the option at any of the three readings is cheaper than moving.
That changes the strategy. The tenant’s leverage is not the threat to leave; the landlord can do the same arithmetic. The leverage is the clause’s definition and the evidence of signed deals. A written benchmark that shows $15.20 effective is a stronger argument than a counteroffer. Whether the clause supports that reading is a question for the tenant’s attorney.
The notice window is the option
A perfectly priced option is worth nothing if notice goes out late. This lease requires notice no earlier than 12 months and no later than 9 months before expiration:
- Window opens: June 30, 2027
- Window closes: September 30, 2027
The lease will usually also require notice in writing, delivered to a specific address by a specific method. Check the notice section, not just the option section, and send it in a way you can prove.
If the clause sets an opening date, notice sent before it may not count either; ask your attorney how your clause reads. Put both dates on a calendar the day the lease is abstracted.
When the market has fallen
Options are usually discussed as protection for tenants in a rising market. A falling market turns the question around.
Say the same tenant’s option set the renewal rent at a fixed $17.50, and similar space now leases at $15.20 effective. Exercising would cost:
($17.50 less $15.20) × 4,000 square feet = $9,200 a year, or $46,000 over five years
The tenant does not have to exercise. It can negotiate a new lease with the market evidence on the table, keeping the option as a ceiling while the window is open. The landlord faces the same arithmetic from the other side: months of downtime, leasing costs and improvements if the tenant leaves. So the realistic range runs from about $15.20 to the $17.50 option rent, and both sides can see it.
Negotiate first, or exercise first
Some tenants exercise the option to lock in the right, then negotiate the rent inside the clause’s process. Others open talks early and keep the option as a fallback.
The second path carries one risk worth naming: talks that run past the close of the notice window. If negotiations are under way and the window is closing, the safe course is usually to decide in writing before the deadline, not after. Which path fits your lease, and how to word the notice, is a question for your attorney.
Before you send notice
- Abstract the option, the notice section and every amendment that touches either
- Compute the window as calendar dates
- Benchmark market rent on the basis the clause defines
- Price the rent under each reasonable reading of the clause
- Price the cost of moving, including build-out and downtime
- Set a walk-away number before talking to the landlord
- Ask your attorney whether to exercise first and negotiate after, or the reverse
The lease cost calculator shows what each option rent and escalation adds up to over the full term.
For landlords facing an option
The same math applies from the other side. A landlord who knows the effective market rent can set a realistic renewal figure early, before the tenant has a benchmark of its own.
Lease term also matters to lenders. Per the Mortgage Bankers Association, seventeen percent ($875 billion) of the $5.0 trillion of outstanding commercial mortgages held by lenders and investors is scheduled to mature in 2026. A landlord refinancing with a major tenant inside its notice window has a reason to settle the renewal before the lender asks.
Walk in with the numbers
A market rent benchmark gives comparable asking and achieved rents, adjusted, as a range, in 7 business days from $1,500 per property (indicative). A renewal and negotiation brief adds the option terms and a priced term sheet with a walk-away number, in 7 business days from $2,000 per lease (indicative). We do not negotiate on your behalf or act as a broker. Start with a free 30-minute scoping call, ideally before the notice window opens.
