What began as isolated moves is becoming a broader shift, as firms respond to constrained supply by exploring new locations, committing earlier and reshaping London’s office geography.
BP recently announced it would leave London's West End for a 192,000 sq ft space in Landsec's Timber Square on the South Bank. It is not the West End’s first loss of a global blue-chip occupier, but it may mark a turning point – where what were once isolated moves begin to form a more sustained shift as companies trade prestige for more space, better specifications and more attractive rents.
It's not to say the West End is less attractive – it remains the default choice for many firms seeking high-status headquarters – but the scarcity of premium space is becoming so acute that companies either have no suitable options, or the economics just don't stack up.
BP plans to consolidate staff from its West End HQ in St James's Square and its campus in Sunbury, Surrey, into a single building – one that comes with communal clubrooms, skyline terraces and is all-electric, powered by air source heat pumps and solar. No available core West End building could accommodate a lease of that size, and even if it were, rents and business rates would be roughly double those at Timber Square.
Lease events
Construction has slowed sharply as higher build and borrowing costs, geopolitical uncertainty and stricter energy-efficiency requirements have weighed on viability. The West End has the lowest vacancy rate of any Central London submarket, with Grade A vacancy exceptionally tight at just 1.1%. Prime submarkets remain particularly constrained, with Mayfair reporting Grade A vacancy rates as low as 0.3%. The City core, meanwhile, has only 1.8 million sq ft of best-in-class office space available.
The lack of prime space is pushing rents higher in London. The West End submarket has seen prime rents increase by 6.1% during the year through Q1 2026 to £175 per sq ft, while the City submarket has seen prime rents rise 8.8% to £92.50 per sq ft.
Demand continues to outstrip supply. Through 2025, quarterly take-up of Grade A space in Central London averaged more than a quarter of total available stock. Since 2021, total take-up has exceeded new supply by more than 10 million sq ft.
The imbalance looks set to persist. Just 1.4 million sq ft has been approved for delivery out to 2031, compared with average annual take-up of 8.4 million sq ft over the past five years, according to BNP Paribas Real Estate calculations – although delivery could yet be constrained by construction costs, regulatory risk and wider economic uncertainty.
These shortages are creating pressure in an increasingly active market, with larger occupiers – aware of limited options – now engaging well ahead of lease events. There were 32 deals above 50,000 sq ft during 2025, marking the most active year for this size bracket since 2021, including Visa securing 300,000 sq ft at 1 Canada Square, E14, alongside FTI Consulting pre-letting approximately 102,000 sq ft at One Exchange Square, EC2.
A release valve
So-called non-core locations in London such as the South Bank, Midtown and King’s Cross have become the release valve for these pressures. Total occupancy costs are far lower: rents on the South Bank are around £87.50 per sq ft, versus about £175 in the West End, while business rates are roughly £15 per sq ft compared with £30 per sq ft in the West End. For a 100,000 sq ft building, the cost differential could amount to about £10.25m per year.
And while the term "non-core" might suggest inferiority, that is far from the reality. The South Bank offers significant river frontage, sits between the political, creative and financial centres of the West End and the City, benefits from strong connectivity and is anchored by cultural institutions such as the Tate Modern, Southbank Centre and the National Theatre.
King’s Cross, meanwhile, is becoming an AI powerhouse. In recent weeks, OpenAI has taken 88,500 sq ft at Regent's Quarter and Anthropic has signed for 158,000 sq ft at British Land's and Royal London Asset Management's One Triton Square. The Knowledge Quarter, a roughly one-mile radius cluster around King’s Cross, St Pancras and Euston, is also home to Google DeepMind, Meta and the UK innovation agency Digital Catapult.
Further east, Canary Wharf presents a more overtly cost-led proposition, underpinned by a broader placemaking strategy that continues to reshape the estate’s offer. Stratford shares a similar pricing advantage, but is increasingly appealing to a wider mix of occupiers beyond financial services. As these moves gather pace, they can become self-reinforcing, with firms drawn to the benefits of clustering alongside peers, talent and supply chains.
Moving earlier
The shift towards non-core markets is not without its own constraints. Supply in locations such as Midtown remains below both five- and ten-year averages, while prime availability on the South Bank is also tightening as demand continues to accelerate. Rents are responding accordingly. On the South Bank, prime office rents rose 12.9% in the year through Q1 2026 – one of the strongest performances across Central London – despite a relatively healthy development pipeline of approximately 1.27m sq ft currently under construction.
These pressures are changing behaviour. Occupiers are committing earlier, often engaging three to four years ahead of lease events rather than the historically typical two years. In some cases, businesses with 2030 lease expiries are already actively exploring options, reflecting a growing recognition that waiting carries real financial risk in a supply-constrained market.
BP’s move is best understood as a signal rather than an isolated decision. As availability tightens and costs continue to diverge, similar shifts are likely to follow – gradually turning what were once exceptions into a more established pattern of demand.
This article first appeared on Green Street News.
