The City of London Corporation has published glossy CGI renderings of a dramatically transformed skyline, showcasing towers it expects to complete by 2031. The timing is pointed: released just ahead of MIPIM, Europe's largest property investment conference, these images arrive alongside data showing an 84 per cent year-on-year jump in planning approvals this January. The message to international investors is unmistakable—Britain's financial district is betting on a construction surge at precisely the moment when office demand remains one of the most contested questions in commercial property.
That bet comes with considerable risk. Whilst the Corporation's policy chairman Chris Hayward claims 'record demand for high-quality, amenity-rich office space' and insists vacancy rates in the City core continue falling, those assertions require scrutiny against broader market realities. Hybrid working has become standard across financial services, and office vacancy rates remain elevated across most Western financial centres compared to pre-pandemic levels.
The gap between promotional rhetoric and market fundamentals deserves attention. Four major schemes received approval in the opening weeks of 2025, including the long-delayed 1 Undershaft, which will become the Square Mile's tallest building. But planning approval and completed construction are vastly different propositions, particularly for towers that have faced previous delays and depend on securing anchor tenants.
The vacancy question
Hayward's claim that 'leasing activity reached its strongest annual performance since 2019' actually tells a more complicated story than intended. Using 2019 as the comparison point—the final full year before the pandemic—means current activity may still lag historical norms from earlier in the decade. Strong performance relative to 2020-2023 is hardly a ringing endorsement when those years saw widespread uncertainty about the future of office work itself.
The assertion about falling vacancy in the 'City core' also requires unpacking. That phrase matters. The Corporation appears to be drawing a distinction between premium space in the most desirable locations and the broader Square Mile market. According to property consultancy Knight Frank, overall office vacancy across the City of London stood at 8.1 per cent in the final quarter of 2024—down from pandemic peaks but still elevated compared to the sub-6 per cent rates seen in 2018-2019.
What's happening is a bifurcated market. Demand for newly built, amenity-rich towers with high environmental ratings remains genuinely strong, whilst older Grade B stock struggles to attract tenants. Financial services firms and legal practices are consolidating staff into higher-quality space rather than expanding their total footprint. That creates competition for premium buildings but doesn't necessarily support the volume of new supply the Corporation is celebrating.
Marketing exercise or genuine confidence
The Corporation's planning and transportation chairman Tom Sleigh made the strategic calculation explicit, stating the message to global investors is that 'the City of London is open, confident and building at scale'. This is a marketing pitch, and understanding it as such clarifies what's actually happening. London faces genuine competition for international capital in the post-Brexit landscape, with Frankfurt, Paris and Amsterdam all positioning themselves as alternative European financial hubs.
These CGI images and planning approval announcements serve a dual purpose. They demonstrate to potential tenants that the City can still deliver large-scale development, addressing concerns about regulatory sclerosis or planning delays. But they also signal to international property investors that London remains a viable destination for capital deployment despite political and economic uncertainty.
Whether that confidence matches tenant appetite is another matter entirely. The developments mentioned—1 Undershaft, 70 Gracechurch Street, 130 Fenchurch Street—represent substantial new supply entering a market where many firms have reduced their space requirements by 20-30 per cent compared to pre-pandemic levels, according to research published by Savills in late 2024.
The speculative question
Commercial property development operates on long time horizons, and what makes financial sense today may look distinctly different in 2029 or 2030 when these buildings approach completion. Developers and their financial backers are essentially wagering that one of two scenarios will unfold: either hybrid working will give way to a meaningful return-to-office shift, or business growth will drive space requirements upward despite lower per-employee footprints.
Some evidence supports cautious optimism. Financial services employment in the City has proved more resilient than many predicted immediately after Brexit, with headcount data from TheCityUK showing the sector added approximately 7,000 jobs across 2023-2024. Tech companies and professional services firms continue expanding their London presence, attracted by the capital's deep talent pool.
But employment growth doesn't automatically translate to equivalent demand for office space. The maths simply doesn't work when average office utilisation rates hover around 60-70 per cent on any given weekday, according to occupancy data tracked by Remit Consulting.
The more critical question is whether this construction boom reflects genuine undersupply of premium space or speculative development that assumes demand will materialise. History offers cautionary tales—Canary Wharf's initial development in the 1990s famously struggled for years before eventually succeeding, whilst numerous provincial cities have oversupplied office space during optimistic building cycles.
The Corporation's aggressive promotion of these planning approvals ahead of MIPIM suggests some urgency to attract development finance before investor sentiment shifts. Interest rates remain elevated compared to the ultra-low environment that prevailed through the 2010s, making the financial engineering behind large office towers more challenging. If international capital becomes more selective—as Hayward himself acknowledged it would—London needs to make its case convincingly.
The skyline images released this week represent aspiration as much as certainty. Whether those glass and steel towers materialise on schedule depends less on planning approvals than on fundamental questions about how people will work in 2030 and whether London can maintain its position as a first-tier global financial centre. The City Corporation is projecting confidence, but developers and their backers will ultimately make those decisions with their chequebooks.
