WAULT — the weighted average unexpired lease term — is the single number most often quoted about a multi-tenant commercial property, and the one most often quoted without its basis. A long average can conceal a cluster of large expiries in one year. A short average can be entirely manageable if the leases are staggered. Before buying, rebuild the rent roll from the documents, calculate the average both ways, and stress-test what happens around each rollover.
What has to be defined before any average is calculated?
The date set. For every occupied unit, record the lease commencement, the next break date, any option date, the rent-review date and the contractual expiry. Add the vacant units and anything under offer rather than quietly excluding them.
Then decide and state the convention: is the term measured to the next break or to contractual expiry? Both are used, they can produce very different answers in the same building, and a number quoted without its convention is not information. Where break options are material, calculate both and present both.
Why calculate by rent and by area?
Because they answer different questions. Weighting by passing rent tells you how long the current income is contractually attached to tenants. Weighting by area tells you how long the building is contractually occupied.
A small unit paying a high rent distorts the first. A large unit paying a low rent distorts the second. Calculating only one of them is how a rent roll gets presented favourably without anyone stating anything untrue. Before weighting by rent, reconcile the passing rent to the invoices and the receipts, because a rent roll is a summary and a summary is not evidence.
What does an expiry ladder show that an average cannot?
Concentration. Plot rent, area and tenant count by quarter or by year, and mark every break date that falls before the related expiry. An average of several years can still contain a year in which a large share of the rent falls away at once — and that year is the risk, not the average.
Show current vacancy on the same chart rather than in a footnote. A ladder that only plots leased income makes an under-let building look like a fully let one with a good profile.
What capital and downtime sit behind each cluster?
Re-letting is not free and it is not instant. For each expiry cluster, estimate a realistic vacant period, leasing fees, any fit-out contribution or rent-free incentive the market will expect, reinstatement or make-good works, and the landlord capital needed to put the space back into lettable condition.
Vary the assumptions by unit type and by the depth of demand for that kind of space. The risk in a concentrated expiry year is not only that rents may be lower; it is that cash goes out to re-let several units at the same time as income falls. That combination is what strains a building's finances.
How do you overlay tenant quality?
An expiry from a growing occupier that has invested heavily in its fit-out is a different proposition from an expiry from one that is paying late and using half its floor. Review payment history, the fit and importance of the space to the tenant's operations, how intensively it is used, any renewal correspondence and whether alternative premises are being viewed.
Use that evidence to weight scenarios, not to remove them. A verbal indication that a tenant intends to renew is useful context and is not a lease. Keep the contractual risk in the model and let the evidence move the probabilities.
Where does the cost base fit into the picture?
Alongside the income, because vacancy changes who pays. Service charges in Dubai are approved annually by RERA for each project and charged by unit area, and the owner remains liable even where a tenant has not paid. In a multi-let building, void units mean the owner absorbs the service charge and any common-area cost attributable to that space.
Check the approved figure for the project on the DLD Service Charge Index and look at the reserve fund position, since major replacement works landing in the same period as a concentrated expiry is the scenario that hurts most. This reflects what was published as of September 2026 and can change — verify at the official source.
How should the analysis feed price, debt and negotiation?
Share the expiry ladder and the downside cash requirement with your valuer and, where finance is involved, your lender. Compare the debt service and the available liquidity during the heaviest rollover period rather than in an average year, because covenants are tested at the worst point and not on average.
The analysis then gives you options: negotiate the price, ask the seller to renew specific leases before completion, seek a retention, or require a reserve. Any of those is a better outcome than discovering the concentration after you own the building.
What should be recorded for later?
The assumptions, not just the conclusion. Write down the convention you used, the vacancy and incentive assumptions per cluster, the tenant evidence you relied on, and the scenario you adopted. Then revisit it annually against what actually happened.
This is what turns a purchase model into an asset management plan: you know which leases to start working on eighteen months out, and you know which of your original assumptions has stopped being true.
When does this apply?
To anyone buying a multi-tenant office building, a retail parade, a mixed commercial property or a whole building in Dubai, and to owners preparing one for sale who want the rent roll to withstand a buyer's analysis. Multi-let commercial and retail stock sits across Business Bay, JVC, JVT, Al Jaddaf, Motor City, Majan and Arjan, and lease structures differ between schemes and landlords.
It does not apply to a single-tenant unit, where the analysis is about that one covenant and that one lease, and it is not a substitute for a valuation or for legal review of the leases themselves.
Bottom line
Build the date set before the average, and state whether the term runs to break or to expiry. Calculate by rent and by area, include vacancy, and plot the expiry ladder to find the concentration. Attach realistic downtime and re-letting capital to each cluster. Overlay tenant evidence to weight the scenarios rather than to erase them. Then take the worst rollover period to your valuer and your lender, and use it in the negotiation.
Frequently asked questions
Is a higher WAULT always better?
No. It can improve income visibility, but it says nothing about whether the rents are sustainable, how strong the tenants are, whether break options undercut the term, what the review clauses will produce, or how concentrated the expiries are. A long average built on one large tenant with a break option can be weaker than a shorter average spread across many staggered leases.
Should vacant space be included in the calculation?
It should always be shown explicitly, whichever way you treat it in the arithmetic. Excluding vacancy silently makes the expiry profile look stronger than the building's actual income position. State the occupancy alongside the average, and plot the vacant area on the expiry ladder so that a reader sees the leased income and the empty space at the same time.
Is WAULT measured to break or to expiry?
Both conventions are in use, and neither is wrong as long as it is stated. Measuring to break is the more conservative view because it assumes every break is exercised; measuring to expiry assumes none is. Where break options cover a meaningful share of the rent, calculate both and treat the gap between them as the size of the uncertainty you are buying.
How far ahead should re-letting work begin?
Earlier than most owners start. Lease negotiations, fit-out periods and approvals take time, and a tenant deciding whether to renew is usually looking at alternatives well before its notice date. Use the expiry ladder to identify which leases need attention first, and work backwards from the notice deadlines rather than from the expiry dates.
What if the seller's rent roll does not match the leases?
Treat the leases and the receipts as the source of truth and ask for the difference to be explained in writing. Discrepancies often have innocent causes — a stepped rent, a side letter, an unrecorded concession — but each one changes the income you are buying. Reconcile every line before you rely on the summary, and raise anything unexplained before completion rather than after.
Does a concentrated expiry always justify a lower price?
Not automatically. It justifies pricing the cost of managing it: the downtime, the incentives, the capital and the liquidity needed at that point. Sometimes the right response is a different deal structure instead — the seller renewing specific leases before completion, a retention, or a condition. Concentration is a cash-flow and timing problem before it is a value problem.
Related guides
- Buying a Whole Building in Dubai: Income, Lease and Cost Due Diligence
- Commercial Lease Break Clauses in Dubai: Measure Income at Risk Before Buying
- Buying a Dubai Commercial Property with an Existing Tenant: Lease and Income Due Diligence
- Rent-Free Periods and Fit-Out Contributions in Dubai Commercial Property: Normalise the Income
- Commercial Property CAM Charges in Dubai: Budget, Reconciliation and Lease Checks
Laguna Life is a DLD/RERA-registered brokerage that starts from your goal rather than from what is for sale, and verifies every figure at its official source. Send us the rent roll and the leases for a multi-tenant property you are considering and we will rebuild the expiry ladder with you before you make an offer. WhatsApp wa.me/971561000928 or visit lagunalife.ae. Register your interest now.