Commercial Rent Review: Process & How It Works

Picture a commercial portfolio where three leases reach their review date in the same month, each on a different method. This is where a commercial rent review turns from routine admin into lost income or a tenant dispute. Get the method, timing and notice right, and the rent changes in line with the lease. Get one of them wrong, and you leave money on the table or spark a costly disagreement. In this guide, I will walk through how these reviews work, the methods behind them and the process that keeps each one on track.

What a Commercial Rent Review Actually Is

A commercial rent review is the process of adjusting rent in accordance with the review clause contained in a commercial lease. The lease specifies when reviews occur, how the new rent is determined and any notice requirements. Rather than renegotiating the rent each year, both parties follow the agreed review mechanism. The lease sets the method, review dates and notice requirements. 

According to the NSW Small Business Commission, most retail leases allow regular rent reviews, usually every 12 months, with the lease setting the method to be used. The wording you sign can shape a property’s return for years. That is why the detail matters more than the headline rent.

The Three Main Rent Review Methods

Commercial leases often use CPI, fixed percentage or market reviews. A lease may use a different method at each review date. Each method changes the rent in its own way. Each method also creates different administrative requirements for landlords and property managers.

CPI Rent Reviews

A CPI review links rent to an inflation index. The lease states which Consumer Price Index series applies. It also sets the formula. The ABS released its first complete Monthly CPI in November 2025. It still publishes a quarterly CPI series for indexation, contracts and other uses.

Always confirm the lease before selecting a monthly or quarterly CPI figure. Check the nominated index, base period and calculation formula, as these vary between leases.

Fixed Percentage Increases

A fixed review changes the rent by a percentage stated in the lease. The parties agree on the rate in advance. This makes the calculation clear. A fixed rate can leave less room for debate than a market review. However, the rent may move away from market levels during a long lease.

Market Rent Reviews

A market review resets the rent using current market evidence. The evidence may include rent for similar premises. A market review often applies during a long lease or when a tenant uses an option. The parties may disagree about the evidence or the valuation method. 

For Victorian retail leases, the Victorian Small Business Commission can appoint a specialist retail valuer. This can occur as a last resort when the parties cannot agree on the rental value and cannot agree on the choice of valuer. Market rent can move up or down. I treat the valuation and the admin as two separate tasks.

How the Commercial Rent Review Process Works

I use one control framework for every review, but the process branches when the new rent is calculated or determined. CPI and fixed reviews move to calculation, while market reviews may require negotiation or valuation.

1. Confirm the Review Date and Method: Check the lease schedule for the date and method. Add the date to the agency calendar well before it falls due.
2. Read the Clause in Full: Check the terms, formula, base period, caps, floors and notice rules. Do not rely on the heading alone.
3. Follow the Required Review Path: Apply the CPI or fixed formula stated in the lease. For a market review, follow any proposal, negotiation or valuation process required by the lease.
4. Prepare and Serve the Required Notice: Use the form, timing and service method required for that review. Keep proof of service and the supporting calculation, proposal or valuation record.
5. Update the Invoicing: Once the rent is approved or set, update the tenant ledger and invoices from the right date. PMVA’s real estate accounting services can support this step under the agency’s direction.

My Commercial Rent Review Control Check

The five-step process moves the review forward. This control check is the final quality gate before I mark the file ready for agency approval:

• The lease type and state or territory
• The review date and method
• The index series, base period and formula
• Any cap, floor or ratchet wording
• The notice period and service method
• The agency approver
• The valuation or dispute process
• The effective date and billing update
• The records saved to the audit trail

This check gives the licensed agency one clear view of the review. It shows the dates, figures and next action. It also makes the file easier to audit later.

Retail and Non-Retail Leases Follow Different Rules

This is where owners and managers get caught. The rules depend on the type of lease. A retail lease and a general commercial lease are treated differently. Retail leases carry extra tenant protections, and these vary by state and territory.

Retail Lease Legislation by State 

Retail leasing legislation differs across Australia. Examples of the governing Acts include:

• New South Wales: Retail Leases Act 1994
• Victoria: Retail Leases Act 2003
• Queensland: Retail Shop Leases Act 1994
• South Australia: Retail and Commercial Leases Act 1995
• Western Australia: Commercial Tenancy (Retail Shops) Agreements Act 1985

Where a lease falls under one of these Acts, stricter rent review rules may apply.

Ratchet Clauses and Market Rent Reviews 

A ratchet clause can stop rent from falling below a set point. The rules for these clauses differ by state.

In Queensland, a ratchet provision is generally void where the review basis allows the rent to decrease. An exception may apply where a major lessee gives the required written notice before entering the lease. Queensland law also requires each review to use one basis. The Act allows some non-market methods to form one combined basis.

Western Australian retail lease law also limits terms that stop market rent from moving up or down. The label in the schedule does not decide whether a lease is retail. The answer depends on the facts and the law.

I confirm the lease type with the licensed agency before the review starts. If the lease type or clause is unclear, I flag it for legal advice.

The Administration Behind Every Rent Review

A rent review is only as reliable as the system running it. Across the commercial agencies I work with, the errors rarely come from the maths. They come from the admin around it. This administrative layer is where consistent systems provide the greatest value.

Where Rent Reviews Commonly Go Wrong 

These are the slip points I see most:

• Missed Review Dates: A review date passes unnoticed. The increase may then be delayed, disputed or restricted, and whether it can be backdated depends on the lease and applicable law. Correcting a late review is awkward, and it can strain a good relationship.
• Reading the Heading, Not the Clause: A manager applies CPI without checking for a cap. Or they use the national figure when the lease names a capital city series. Either error can produce a notice that misstates the rent.
• The Wrong Notice: A notice served in the wrong form or outside the lease timeframe can put the increase at risk.
• Options Left to Drift: An option has its own dates. For many Western Australian retail leases, the landlord must give the tenant between six and 12 months’ notice before the option deadline. 
• Invoicing That Lags the Review: The rent changes on paper, but the recurring rent charge and tenant invoice are not updated. Billing and the lease then fall out of step.

What a Structured System Looks Like in Practice 

When Phil Jones, principal of Brisbane agency Propel Realty, came to us, he managed both residential and commercial properties. The administrative load was holding the agency back from the service he wanted to deliver. Phil’s example covers broader residential and commercial administration rather than rent reviews alone, but it shows the value of giving recurring portfolio tasks clear ownership. 

Over 18 months, Phil and I moved more than 20 processes to his dedicated virtual assistant. That covered over 300 individual daily and monthly tasks. As Phil describes it, the change brought “increased levels of service, communication and professionalism to his end clients” and “streamlined systems and industry benchmarked processes.” You can read Phil’s story in full.

What My Team Can Handle

I want to be clear about where my support sits. My team can:

• Track review dates
• Prepare notices for the agency to approve and issue
• Apply the agreed CPI or fixed formula
• Update approved rent in the agency’s system
• Keep the supporting records together

If the clause does not clearly identify the method, index or notice requirement, my team stops at extraction and escalation rather than choosing a legal interpretation.

My team completes these tasks under the licensed agency’s direction. A qualified valuer may need to set market rent. This depends on the lease and the law.

Questions about the meaning of a lease belong with a lawyer. My back-office administration support can cover the wider repetitive tasks around the lease.

Common Questions About Commercial Rent Reviews

Turning Rent Reviews Into a System You Can Trust

A commercial rent review is more than a single date in a lease. It is a structured process that runs from interpreting the review clause through to updating invoices and maintaining accurate records. Agencies with consistent systems are less likely to miss review dates, issue incorrect notices or create avoidable disputes.