London’s Empty Towers

Vacancy rates at a 20-year high, yet prime rents are breaking records. How did one of the world’s great cities end up with so many buildings standing dark?

Walk through the City of London late on a Wednesday evening and you might notice something peculiar. Dozens of towers, monuments to post-war and post-millennial ambition, stand almost entirely dark. The occasional security guard light flickers on a ground floor. A lift indicator blinks somewhere on the 14th. But floor after floor, those long rows of windows are simply black. London, the financial capital of Europe, has a vacancy problem — and it is one of the most revealing stories about how cities change.

London’s commercial vacancy rate hit a 20-year high in late 2024, sitting at around 10% across the city — more than double the pre-pandemic figure of under 5%. In certain areas, the picture is even starker… What went wrong, and who is responsible?

The Pandemic Rearranged Everything

The most obvious culprit is COVID-19. When the March 2020 lockdown began, millions of Londoners discovered they could work perfectly well from a kitchen table. By the time offices began to reopen, the implicit social contract of the five-day commute had collapsed.

Companies renegotiated leases, downsized, or simply handed back space they no longer needed.

Hybrid working has since stabilised at roughly three to four in-office days per week for most professional employees. That sounds like a marginal change, but its effect on real estate demand is enormous. If a firm’s staff are in the office 60–80% of the time rather than 100%, it may only need two-thirds of its former footprint. Multiply that across tens of thousands of businesses and the mathematics of vacancy become unavoidable.

Hot desking became the norm almost overnight. Dedicated desks, the quiet pride of middle management, gave way to booking systems and touchdown zones. The result: the same headcount occupying meaningfully less floor space.

“The headline vacancy rate suggests a bargain-hunter’s paradise. The reality is the opposite: quality space is almost entirely exhausted, while obsolete floors sit empty gathering dust.”

A Two-Speed Market

Here is where London’s story becomes genuinely strange. Despite record vacancy, prime rents in the West End have surged beyond £150 per square foot — with some Mayfair and St James’s deals hitting £200 per square root, figures never seen before. How can a market with so much empty space simultaneously be experiencing a shortage?

The answer lies in a brutal divide between old and new. By the end of 2025, Grade A offices accounted for 74% of all leasing activity across the year, even though they make up only around a quarter of existing stock. — the highest share ever recorded, and a decisive shift from the prepandemic average of 59%, according to Cushman & Wakefield. In Q2 2025 alone, Grade A take-up in the West End hit a record-breaking 90% of total volume.

What is sitting empty is not what businesses want. The millions of square feet of vacant 1980s and 1990s stock — poor natural light, inflexible floor plates, dated infrastructure, and increasingly non-compliant energy systems — are essentially obsolete. Landlords holding it are offering generous rent-free incentives to fill it, but takers are scarce.

The Canary Wharf Question

Once the jewel of Thatcher-era ambition, Canary Wharf has become the sharpest symbol of commercial vacancy. With major banks departing for the City, vacancy rates exceeding 8%, and an identity long tied to institutions that no longer need it, Wharf landlords are pivoting hard — proposing mixed-use schemes, residential conversions, and life sciences hubs. Whether those bets pay off will define one of London’s most significant urban regeneration stories of the decade.

The Regulatory Squeeze

Compounding the structural shifts is an unforgiving regulatory environment. The government’s Minimum Energy Efficiency Standards (MEES) require commercial buildings to meet increasingly strict energy ratings, with a 2027 deadline fast approaching. The inconvenient truth is that more than 80% of central London commercial properties currently fail to meet those standards. Without major — and expensive — upgrades, they will become legally unlettable within a few years.

The cost of bringing older stock up to compliance has been estimated at up to £5 billion for central London alone. For many landlords, particularly those holding secondary assets in less desirable locations, the sums simply do not stack up. Refurbishment costs exceed what the building’s likely rent roll could ever justify.

Business rates compound the pain. The 2026 revaluation has produced significant uplifts for most occupiers, adding to already high operational costs and encouraging businesses to rationalise their space further or relocate to cheaper submarkets.

The Obsession with “Quality”

There is a more sociological dimension too. The post-pandemic office is no longer simply a place where work happens — it is a recruitment tool, a brand statement, and a wellness offering. Companies competing for talent in a tight labour market have come to understand that the quality of the physical environment matters to employees who have spent years working comfortably from home.

This has produced a relentless flight to quality. Businesses want roof terraces, cycle storage, end-of-trip facilities, high ceilings, exposed brickwork, abundant natural light, and BREEAM sustainability credentials. The buildings that offer these things are oversubscribed. Those that do not are, increasingly, overlooked — however cheap the rent.

The Conversion Question

With so much empty commercial space and an acute housing shortage — London faces a shortfall of more than 150,000 homes — the obvious question is whether offices can become flats. The answer is: sometimes, with difficulty, and not nearly at the scale the crisis demands.

Permitted Development Rights, expanded in 2024 with the removal of a 1,500 square metre floorspace cap, theoretically make conversion easier. The City of London Corporation has plans to convert empty office buildings in the Square Mile into roughly 1,500 residential properties by 2023. But for every building that lends itself to conversion, many more do not. Windowless interior rooms, deep open-plan floors, and basement configurations designed for trading floors make some buildings genuinely unsuitable for residential use without near-total reconstruction.

The financial calculus is also difficult. Residential developers in London face high construction costs, planning uncertainty, and a market that does not always price new-build flats at levels that make conversions economically viable.

What Happens Next?

The most credible forecasts suggest a gradual stabilisation rather than a dramatic resolution. Vacancy rates are expected to ease from their current highs as refurbishments complete and non-compliant buildings are withdrawn from the market. Prime rents will likely continue rising 3–5% annually through 2027, driven by the scarcity of genuinely good space.

What is less clear is the fate of the millions of square feet that nobody seems to want. More than half of London’s existing office buildings — around 147 million square feet of so-called “secondary” stock — are expected to become functionally obsolete by 2030. Industry bodies including Knight Frank and the London Property Alliance argue for treating offices as economic infrastructure, urging prioritised support for refurbishment and arguing that upgrading at-risk buildings could generate an £84 billion economic boost.

Without that intervention, the prognosis is stark: a city of gleaming, overpriced towers surrounded by a growing penumbra of darkened, deteriorating buildings — occupied by nobody, generating nothing, and awaiting a fate that planning constraints, financing costs, and sheer inertia conspire to defer indefinitely. London’s empty towers are not simply an aesthetic problem. They are a symptom of a city whose property market, planning system, and post-pandemic working culture are pulling in three different directions at once — and have yet to find their
equilibrium.

“More than half of London’s office buildings could be obsolete by 2030.
The city is not short of space. It is short of the right kind of space —
and the will to transform what remains.”

A Model Worth Watching

Not every empty building needs to become a luxury flat or a trophy tower. One organisation quietly demonstrating a third way is the Affordable Workspace Partnership (affordableworkspace.org.uk) — a not-for-profit Community Interest Company with decades of placemaking experience and a presence on the approved workspace list of every London borough. Rather than waiting for the market to resolve the vacancy problem, AWP works directly with developers, asset owners and local authorities to turn underused commercial space into
affordable Creative Centres for micro businesses, freelancers, and entrepreneurs — particularly those who are under-represented or face barriers to entering the formal economy.

With locations already operating across New Cross Gate and Queens Park, and new centres opening at Alexandra Palace, Blackfriars, South Tottenham and Park Royal, AWP is showing that space can generate social and economic value without requiring the long planning battles or prohibitive refurbishment costs that stymie larger schemes. Their model — rooted in Section 106 agreements and joint ventures with developers — is precisely the kind of pragmatic, partnership-driven approach that London’s vacancy crisis demands. While policymakers debate grand strategies, AWP is already putting the lights back on.

Affordable Workspace Partnership

AWP operates affordable Creative Centres for micro businesses across London, partnering with developers, local authorities, and the Mayor of London to bring vacant commercial space back into productive use. Their approach combines placemaking expertise, S106 experience, and a commitment to diversity and inclusion — supporting entrepreneurs who might otherwise be priced out of the city entirely. Get in touch to find out more.