Two buildings sit in the same portfolio review. One is fully occupied, rent collected in full, no arrears, nothing flagged. The other shows a vacant unit and a rent-free period still running on a recent letting. On any occupancy report, the first building looks like the stronger asset and the second looks like the one needing attention. Look instead at what happens to each building’s income over the next three years, and the ranking can reverse completely. The first may have most of its rent exposed to break options or lease expiries within twenty-four months. The second may have income that is staggered, secure and backed by tenants with years left to run. Occupancy tells you what is happening today. It tells you almost nothing about what happens next.
Income at risk is a different question from occupancy
The framework worth building, and the one too many investment reviews skip, is straightforward to state and harder to apply properly: how much of this asset’s income is genuinely at risk over the next one, three and five years, once break options, lease expiries, and known tenant or market conditions are taken into account? A building can be 100% let and still have the large majority of its rent exposed to a decision within a short window. Another building can carry visible vacancy today while having a lease profile staggered comfortably over a decade, with limited concentration in any single year. Occupancy alone cannot distinguish between these positions, because it is a snapshot rather than a trajectory. Nor does it necessarily describe the rent being received: occupied floorspace, occupancy measured by estimated rental value and contracted income are different measures, particularly when incentives are running.
This is worth being precise about what it does not cover. How a tenant actually exercises a break clause, the statutory and contractual mechanics of a rent review, or how an assignment or surrender is negotiated are questions for the lease itself and are covered properly elsewhere on Property Front Page. What matters here is the aggregate consequence: how the pattern of events across a building, or a portfolio, translates into future income, capital expenditure and valuation. Rent reaching a break or expiry date is exposed to a decision, not necessarily about to vanish. A break may go unused; in England and Wales, many business tenants have renewal protection under Part II of the Landlord and Tenant Act 1954 unless the tenancy has been validly contracted out or an exception applies. The Law Commission’s current examination of business tenancies is a reminder that contractual expiry and vacant possession are not interchangeable. A rent review is different again: its financial effect depends on the review provisions, rather than the event date alone.
What sits behind a lease event
A lease expiry or break option is rarely just a binary occupied-or-vacant outcome. It opens a chain of possibilities that each carry different financial consequences, and a sound assessment has to weigh the realistic range rather than anchor on the most convenient one. Whether a tenant renews depends on its own business trajectory, its covenant strength and whether a parent-company guarantee or rent deposit will continue to support the next period of occupation. Over-rented or under-rented income adds a further layer. A lease signed years ago above prevailing market rent may carry meaningful risk at expiry even while payments continue uninterrupted today; a lease below market can offer an opportunity, but the landlord only realises it if the terms and circumstances allow the rent to change.
A tenant’s break option makes that distinction particularly important. The choice is not always symmetrical: a tenant paying below the rent it could obtain elsewhere may have little financial reason to leave, while a business paying above market, contracting or seeking more suitable premises has an incentive to consider its option. Neither outcome is automatic, since relocation costs, trading needs and the break conditions still matter. An over-rented lease also does not automatically reset downwards at a contractual review; existing upwards-only provisions, indexation and review assumptions can all affect the result. The English Devolution and Community Empowerment Act 2026 provides for restrictions on upwards-only reviews in qualifying business tenancies in England and Wales, but its commencement and transitional arrangements need to be considered: it should not be treated as having retrospectively changed every lease. The important investment distinction remains between the current passing rent and what can realistically be sustained at the next relevant event.
Reletting assumptions matter enormously and are exactly where over-optimistic underwriting tends to hide. An investment case that assumes a vacated unit re-lets within three months, at the current estimate of market rent and with an ordinary incentive package is making three separate assumptions that all need to hold, not one. There may be a marketing void, followed by a rent-free period after occupation has begun; the interruption to effective income can last considerably longer than the time the property stands empty. Refurbishment and fit-out contributions can add a capital cost just as income pauses, while rates and irrecoverable holding expenditure may continue. Energy performance is another possible cost at the same point in the cycle. In England and Wales, the existing non-domestic private rented standard is generally EPC E for buildings within scope, subject to exemptions; the government’s June 2026 interim response proposes EPC B from 2031 for buildings over 1,000 sq m where cost-effective, but that higher standard still requires secondary legislation. Neither today’s compliance cost nor a reasonably foreseeable future upgrade belongs outside the appraisal simply because it is absent from the rent roll.
Tenant concentration and the single-let-versus-multi-let distinction shape how these risks aggregate. A single-let building with one tenant and one principal lease date carries what is sometimes called binary risk: a substantial part of its income may be affected at once. A multi-let building with staggered expiries spreads those events, but a cluster falling in the same one or two years can recreate much of the same exposure. Counting leases is insufficient if one occupier supplies half the passing rent. Nor is spreading the dates necessarily enough if several tenants depend on the same industry or employer: their lease events may be separate while their reasons for leaving are closely connected.
Two buildings, two very different risk profiles
Take two hypothetical assets of similar size, location and current rent roll. Asset A is 100% occupied. On closer inspection, roughly 70% of its annual passing rent is subject to a tenant break option or contractual expiry within the next twenty-four months, concentrated among occupiers whose leases were signed at rents that now look full relative to current market evidence. The 70% is the income exposed to a decision, not the income forecast to disappear; the tenants may stay, negotiate new terms or leave. But it would be unsafe to treat all of that rent as continuing on today’s terms without examining which outcome is plausible.
Asset B is 90% occupied by floorspace, with one unit currently vacant. Its remaining first breaks and expiries are staggered across the next seven years, with no single year exposing more than 15% of its present passing rent. The tenants are spread across industries rather than concentrated in one, and recent local lettings give the landlord a reasonable basis for the vacant unit’s likely rent and time to relet. That empty space still costs money and the expected letting is not guaranteed. But the asset does not have the same immediate concentration of contractual decisions affecting its existing income.
On a pure occupancy basis, Asset A looks stronger today. On an income-durability basis, Asset B is very plausibly the better-underwritten asset, because most of its income is not exposed to a near-term decision that the landlord does not control. This does not mean Asset A is a poor investment — a shorter lease profile can simply reflect a deliberate strategy to buy an asset with near-term reversionary or repositioning potential, priced accordingly at acquisition. It means that anyone valuing Asset A purely off its current, fully-let rent roll, without weighing what happens when 70% of that rent reaches a decision point within two years, risks mispricing the asset.
Why this matters more at the portfolio level than it first appears
The same logic scales up, and often matters more in aggregate than it does asset by asset. A portfolio can show a headline occupancy rate in the high nineties and a respectable weighted average unexpired lease term while carrying a lease-expiry profile heavily weighted towards two or three particular years. The average may conceal the distribution of income between years, the rent concentrated in one occupier and the difference between time to first break and final expiry. If several leases were signed in the same investment cycle, their expiry dates may bring a wave of negotiations, incentives and refurbishment expenditure together. That concentration is especially uncomfortable when it coincides with a planned disposal or debt refinancing: the landlord may need cash for works and incentives just when a lender or prospective buyer is testing the durability of the income that supports the property’s value.
Harworth’s September 2026 half-year results show why the headline needs context. Its investment portfolio reported a weighted average unexpired lease term of 9.9 years to first break and 11.6 years to expiry, two different views of the same underlying leases. Harworth also reported that its EPRA vacancy rate had increased from 0.9% at the end of 2025 to 8.8% at 30 June 2026, largely after a planned surrender at Knowsley to pursue rental reversion or refurbishment. Excluding that site, the rate was 2.5%. The surrender does not prove that a temporary vacancy will produce a better return, but it demonstrates that a worsening occupancy statistic can reflect a deliberate asset-management decision rather than the failure of tenants to pay. The resulting expenditure and time needed to deliver the plan remain part of the risk.
What this means for valuation
The connection to valuation is direct, even though this is not primarily a valuation-mechanics article — that ground is covered properly elsewhere in this section. The point specific to lease events is narrower: a purchaser is acquiring the expected income after allowing for breaks, renewals, rents that may revert to market, voids, incentives and the costs of keeping the building lettable. A stream of rent that looks secure today can be relatively fragile at its next decision point; a temporarily empty unit can hold an opportunity where the likely capital expenditure and time to relet are already understood. The distinction is not captured by applying an arbitrary discount to every short lease. The outcomes have to be weighed against the lease terms, the market and the property itself.
This is also why a valuation that capitalises today’s rent without giving adequate attention to the next lease events can create a false sense of precision. The RICS guidance on discounted cash-flow valuation encourages appropriate consideration of explicit modelling without requiring it in every case; traditional investment valuation can also account for term, reversion and risk. What matters is that plausible outcomes are reflected consistently rather than a break being counted as a certain departure in one part of the appraisal and the same income assumed to continue elsewhere. Two buildings producing identical rent today can carry meaningfully different capital values once the timing, likelihood and cost of their future income are considered.
The discipline this demands
None of this argues that vacancy is good or that occupancy is meaningless — a vacant unit costs money in service charge, business rates liability and marketing spend whether or not it is masking a healthier underlying lease profile elsewhere in the building. The argument is narrower and more specific: occupancy is a photograph, and investment risk lives in the video. A building can look perfectly safe in the photograph while the video shows most of its income arriving at a cliff edge within two years, and the reverse is equally true. Underwriting an asset, or a portfolio, on today’s occupancy figure without mapping what its income actually does over the next several years is not a simplification. It is answering a different, easier question than the one that actually determines what the asset is worth.
This article provides general information and analysis about UK commercial property investment and leasing, not legal, tax, energy-compliance, valuation, lending or investment advice. Lease rights, rent-review rules, energy standards and the consequences of expiry differ according to jurisdiction, contractual terms and property circumstances. Seek appropriate professional advice before making acquisition, finance, valuation or asset-management decisions.
