Office Rent in London: A Market Guide for 2026

London Office Rent Market Overview

The cost of London office rent varies significantly by location and building quality, and the gap between the best stock and the rest has rarely been wider. In high-end areas like St. James’s and Mayfair, top-quality (Grade A) offices now command headline rents around £200 per sq ft, with the most prestigious deals reaching £201 per sq ft at 77 Grosvenor Street in Q1 2026. Average prime rents in the West End sit at £165 per sq ft, while typical Grade B offices in less central locations remain far more affordable at £70 to £103 per sq ft. The highest recorded office rent in the UK was at 30 Berkeley Square in Mayfair, reaching £277.50 per sq ft for a 2,700 sq ft suite, and current super-prime deals are once again approaching those historic levels.

Latest Market Figures

The London office market has carried strong momentum into 2026. Central London leasing reached 2.2 million sq ft across 152 transactions in Q1 2026, up 6% on Q1 2025 and 1% above the ten-year average. Active demand hit a new record of 14.6 million sq ft, with 47% of occupiers looking to expand and just 15% looking to downsize. Pre-letting activity reached a Q1 record of 738,000 sq ft, a clear sign of sustained occupier confidence in best-in-class space.

The flight to quality intensified further in Q1 2026, with Grade A space accounting for 92% of take-up and BREEAM Excellent or Outstanding buildings making up 53% of the total. In the City, the average prime rent rose to a record £130.80 per sq ft, up 40% on Q1 2025, with a new top rent of £160 per sq ft achieved at 1 Leadenhall, EC3. Seven separate City transactions completed at rents above £100 per sq ft in Q1 alone. In the West End, the average prime rent stood at £165 per sq ft, with the top rent of £201 per sq ft set at 77 Grosvenor Street, W1.

The Tech & Media sector narrowly overtook Insurance & Financial Services as the most active sector for the first time in six years, accounting for over 40% of active requirements. Recent landmark lettings include Anthropic and OpenAI taking 158,000 sq ft at 1 Triton Square, NW1, and 88,500 sq ft at Jahn Court, N1, respectively. Investment activity has been more measured, with Q1 2026 turnover of £1.79 billion across 48 assets, although the pipeline of assets under offer reached £2.78 billion, 6% above the typical Q1-end average and pointing to delayed rather than collapsed deal flow. Prime yields stand at around 5.25% in the City and 3.75% in the West End.

How does this affect renting an office in London?

If you’re planning to rent an office in London, current market conditions highlight the importance of early planning and decisive action. The supply of premium, centrally located Grade A space is exceptionally tight. The City Core vacancy rate sits at 6.0%, 210 bps below its long-term average, while the West End Core (Mayfair/St James’s) is at 4.1%. Mayfair alone has tightened a further 50 bps this quarter to 3.4%, leaving just 12 months of supply at average take-up rates and making it the most undersupplied submarket in the West End.

Competition for the best buildings is intense, and occupiers are increasingly committing to space years ahead of lease expiry. We recommend starting your search and lease negotiations 12 to 18 months before your planned move, and engaging with a fit-out company early to make sure your new office actually supports the way your team works. For larger requirements (over 100,000 sq ft), lead times are even longer, with many occupiers now securing space up to four years in advance. There are currently 38 active occupiers chasing requirements over 100,000 sq ft against just 24 Grade A options of that size available now or within six months.

Supply Outlook and Future Trends

The Q1 2026 picture shows a market with a record volume of completions arriving in the short term, followed by a sharp tightening in the pipeline. Savills expects total 2026 City completions of 4.85 million sq ft, 39% above the long-term average, but 37% of the remaining pipeline is already pre-let, rising to 53% in the City Core. In Mayfair, more than half (54%) of space due to deliver by the end of 2027 has already been spoken for. Across the wider 2026 to 2029 pipeline, only 21% has been pre-let so far, which is 4% below the typical proportion at this stage and suggests further commitments are likely as occupiers move early to secure quality.

Beyond 2026, viability pressures and rising construction costs are starting to bite. Cushman & Wakefield reported at the end of 2025 that the City Core had just 1.1 years of Grade A supply left against a 10-year average of 1.7 years, while Mayfair had only 0.7 years. With the post-2027 pipeline thinning and many schemes yet to start on site, the structural shortage of best-in-class space is set to deepen. City supply at the end of Q1 2026 stood at 9.8 million sq ft (a vacancy rate of 7.0%), and the West End at 7.8%, but these headline figures hide the gap between Grade A and Grade B. Older, lower-spec stock is increasingly being repositioned, refurbished or converted to alternative uses.

For businesses looking to rent office space, this supply shortage brings both challenges and opportunities. Competition for premium space will remain fierce throughout 2026 and 2027, and those willing to look at emerging submarkets or buildings undergoing ESG-focused refurbishment may find better value. Whether you’re planning to expand, relocate, or carry out an office fit-out, understanding these supply constraints is essential for making informed decisions on timing, location, and budget. For a visual overview, check out our map of office rent in London.

Contents

1. Prime Rent in London
2. City of London & Southbank Office Rent
3. West End & West London Office Rent
4. Mid Town Office Rent
5. London’s Tech Belt
6. East London Office Rent
7. Grade A and Grade B Rent
8. From Prime Rents to Super Prime Rents
9. Key Trends and Shifts in London’s Office Landscape
10. FAQs and Related Questions on London Office Rent

Prime Rent in London

Despite a more measured wider economy, prime rental rates across London held up exceptionally well through Q1 2026. A chronic shortage of best-in-class, ESG-compliant office space has pushed prime rents to fresh records in key submarkets:

• West End: The premium sector continues to lead the capital. Prime rents in Mayfair and St. James’s average around £165 per sq ft, and a new top rent of £201 per sq ft was set at 77 Grosvenor Street, W1, acquired by SoftBank. New submarket records were also achieved in Soho (£165 per sq ft at 20 Air Street) and Covent Garden (£142.50 per sq ft at 90 Long Acre).
• City Core: The City has seen a step-change in pricing. The average prime rent rose 40% year-on-year to £130.80 per sq ft, up from £105.26 the previous quarter. A new record top rent of £160 per sq ft was achieved at 1 Leadenhall, EC3, and seven Q1 transactions completed at over £100 per sq ft (Savills, Q1 2026).
• Emerging Submarkets: SE1 saw a new record rent of £140 per sq ft at The Delft, 3–5 Montague Close, while Farringdon and Midtown continue to benefit from the “Elizabeth Line effect”, with tenants prioritising high-specification assets with superior connectivity.

The gap between City and West End prime rents has narrowed to its lowest level in over 25 years, a rental differential of just 21%, which reflects the intensified appetite for trophy towers in the City. Active demand across Central London reached a record 14.6 million sq ft at the end of Q1 2026, with 2.8 million sq ft already under offer. Larger transactions (over 50,000 sq ft) are increasingly focused on pre-letting buildings still under construction to secure supply for 2027 and 2028, with pre-lets accounting for a third of all space let in Q1, the highest level on record for a Q1. Supply pressure in the prime segment remains acute. JLL reports new-build vacancy at just 1.2%, its lowest level in five years, with the development pipeline offering limited speculative availability (JLL, Q1 2026).

Investment activity has been more measured. Q1 2026 turnover stood at £1.79 billion across 48 assets, with assets under offer of £2.78 billion pointing to delayed rather than collapsed deal flow. Prime yields remain at 3.75% in the West End and 5.25% in the City. Looking ahead, prime rental growth is forecast at around 4.3% across Central London over the next four years, with constrained supply and continued flight to quality expected to keep upward pressure on premium rents through the rest of the decade. Even as the wider economy stabilises, London’s prime rental market remains strong. Occupiers and investors are focused on quality, modern, and sustainable assets, which is keeping the premium segment at record-breaking rent levels across the capital.

City of London & Southbank

The City & Southbank market has carried strong leasing momentum into 2026. City take-up in Q1 2026 ran 4% above the ten-year average, with growth driven by a flight to quality as professional and financial firms consolidate into higher-specification buildings. The Professional Services sector took the lead in Q1 2026, accounting for a 25% share of take-up, largely driven by US law firms. Insurance & Financial Services followed at 20%, having driven the market for the previous three years.

Major landmark deals have defined the market over the last twelve months. The largest pre-let in Q1 2026 was Herbert Smith Freehills Kramer’s acquisition of 268,000 sq ft at 1 Appold Street, EC2, at £104 per sq ft on a 21-year lease. The quarter also saw the practical completion of GPE’s 2 Aldermanbury Square (321,000 sq ft), now fully pre-let to Clifford Chance.

Southbank had a particularly strong quarter, with SE1 take-up reaching 278,815 sq ft, more than double Q1 2025. BP acquired the Ink Building at Timber Square, 25 Lavington Street, SE1 (191,383 sq ft) in March, while Quantexa pre-let 52,293 sq ft at The Delft, 3–5 Montague Close, setting a new record SE1 rent of £140 per sq ft. Active demand across Central London has reached a record 14.6 million sq ft, and many occupiers are choosing to pre-let space years in advance, with pre-lets accounting for 40% of all space let in Q1, the highest Q1 pre-letting figure on record (Savills, April 2026).

Against this backdrop, rental values across the City & Southbank reached new benchmarks in Q1 2026. The average prime City rent rose to a record £130.80 per sq ft, up 40% year-on-year, with a new top rent of £160 per sq ft set at 1 Leadenhall, EC3. Seven Q1 transactions completed at over £100 per sq ft. The average Grade A rent for the City reached £80.43 per sq ft, up 15% on Q1 2025. Because of the high demand for premium stock, rent-free periods on a standard ten-year lease have tightened slightly and now typically range between 21 and 24 months. Prime office space continues to command record rents as occupiers compete for locations that offer superior amenities and meet strict energy performance standards.

West End & West London Office Rent

The West End office market entered 2026 with a level of urgency not seen for several years. Q1 2026 take-up reached 833,712 sq ft, slightly down on Q1 2025 but with average prime rents holding at £165 per sq ft and a new top rent of £201 per sq ft set at 77 Grosvenor Street, W1, where SoftBank acquired the 1st floor (Savills, Q1 2026). Demand has been led by financial services (particularly hedge funds and private equity), and the Insurance & Financial Services sector now accounts for 34% of all space under offer across Central London, the largest share of any sector.

The largest West End transaction of Q1 2026 was Databricks’ acquisition of the entire c.135,000 sq ft Network Building on Howland Street, W1, on a 15-year lease, taken from Derwent London. This single deal quadrupled Databricks’ London footprint and accounted for around 30% of the Tech & Media sector’s Q1 take-up by itself. The other landmark commitment was BDO’s 220,000 sq ft pre-let at The M Building, Marylebone, where the accountancy firm will relocate from 55 Baker Street in Autumn 2027 (CBRE, BDO release). New sub-market record rents were set in Soho (£165 per sq ft at 20 Air Street, where US law firm Paul Weiss acquired 21,185 sq ft on the 7th floor) and Covent Garden (£142.50 per sq ft at 90 Long Acre).

Availability has reached critical levels in the prime core. Mayfair vacancy fell another 50bps in Q1 2026 to 3.4%, the most undersupplied of all West End submarkets, with just 12 months of supply at average take-up rates. The wider West End Core (Mayfair/St James’s) sits at 4.1%, 100bps below its long-term average. New-build vacancy across Central London is just 1.2%, a five-year low (JLL). The constrained pipeline is unlikely to resolve this any time soon, with over half (54%) of West End space due for delivery by the end of 2027 already pre-let.

Rent-free periods on a typical ten-year lease currently sit at 20 to 24 months in Mayfair and St James’s (Carter Jonas, Q1 2026).

With pre-letting at a record level (550,624 sq ft in Q1 alone, the highest Q1 figure on record), the upward pressure on prime West End rents looks set to continue. Larger occupiers are increasingly committing to space 18 to 24 months ahead of lease expiry, and for requirements over 100,000 sq ft only six options exist across the West End’s central submarkets, two of which are already under offer.

Midtown Office Rent

Midtown has settled into 2026 as a high-value alternative to the West End core. After some quarter-to-quarter volatility through 2024 and 2025, take-up has stabilised, with renewed focus on Grade A space in Holborn and Bloomsbury. Professional services and creative firms continue to drive activity, with leasing volumes reflecting the same flight to quality seen across the rest of Central London — buildings with high energy performance ratings and modern amenities are letting first.

The vacancy rate in Midtown sits at around 5.8%, slightly above the long-term average but reflecting a tightening supply of premium assets. Prime headline rents are up to approximately £85 to £95 per sq ft, with Holborn now reaching £85 per sq ft for prime headline space (Carter Jonas). Buildings near Elizabeth Line stations such as Tottenham Court Road and Farringdon continue to command a clear rental premium, and the lack of significant new schemes coming forward in submarkets like Bloomsbury is keeping a lid on supply rather than demand.

With the Midtown development pipeline for the rest of 2026 already limited, competition for the remaining top-tier floors is expected to keep rental levels firm throughout the year. Net effective rental growth in Midtown ran at 6.0% over the twelve months to Q1 2025, second only to the City, and the same dynamics are still playing out as we move through 2026.

London’s Tech Belt

London’s Tech Belt has had a defining 2026, anchored by a wave of AI-related leasing that has surprised even seasoned market commentators. Tech & Media narrowly overtook Insurance & Financial Services as the most active sector in Q1 2026, the first time in six years, with sector take-up running 30% above the ten-year average (Savills, April 2026). The sector now accounts for more than 40% of all active requirements in Central London, predominantly software and AI companies.

The biggest single deal driving this story is Anthropic’s 158,000 sq ft letting at British Land and Royal London Asset Management’s 1 Triton Square, NW1, announced in April 2026 — a building sized for around 800 people, and substantially more than the company’s current 200-strong London headcount needs. Just before that, OpenAI confirmed its first permanent London office at Nan Fung’s Regent Quarter scheme in King’s Cross, taking around 89,000 sq ft with capacity for 550 staff (Bisnow / CoStar). The largest West End deal of Q1 2026 was Databricks’ pre-let of the entire 136,000 sq ft Network Building, W1 from Derwent London, on a 15-year lease at around £14 million in annual rent. Together with smaller signings from Ripple Labs (around 90,000 sq ft) and others, AI-linked tenants have leased over 1 million sq ft of London office space since the start of 2025, around 7% of all lettings in that period (Bloomberg / Knight Frank).

The geographic centre of gravity has shifted slightly. The traditional Tech Belt of Clerkenwell, Farringdon, Shoreditch and Old Street still leads on activity within the area, supported by the Elizabeth Line. But the Knowledge Quarter around King’s Cross, Euston and Bloomsbury — home to UCL, the British Library, Google DeepMind, Meta, Synthesia and now Anthropic and OpenAI — is the clearer beneficiary of the recent AI wave. Carter Jonas Q1 2025 data put prime headline rents at £92.50 per sq ft in Farringdon, then the City submarket’s most expensive district. Best-in-class refurbished space across Shoreditch, Old Street and Farringdon has been quoted in the £90 to £100 per sq ft range for 2026, reflecting how strongly creative and tech-led occupiers continue to compete for character-led buildings (Oktra, January 2026).

For occupiers looking at the Tech Belt in 2026, the picture has become more nuanced than it was even a year ago. Demand is real, sustainable buildings still command a premium, and the AI cluster is now competing with traditional creative and TMT tenants for the same finite stock. Vacancy rates and headline rents vary materially between submarkets, so checking current data for the specific area you’re targeting is more important now than it has been at any point in the last five years.

East London Office Rent

The story in East London has shifted in 2026. After several quiet years where Canary Wharf and Docklands struggled to compete with the City and West End for major occupiers, the submarket’s fortunes have picked up since the middle of 2025, reflecting the limited availability of good value space in more central districts (Carter Jonas, Q1 2026).

Prime headline rents in Canary Wharf reached £57.50 per sq ft in Q1 2026, up 4.55% on Q1 2025 and up 9.5% over five years. Upper floors of new and refitted Grade A buildings can command £62.50 to £72.50 per sq ft, with refurbished Grade A space sitting in the £35 to £52.50 range depending on floor and outlook. Crossharbour and Stratford remain materially cheaper alternatives, with Crossharbour Grade A at £32.50 to £39.50 per sq ft and Stratford at £45 to £52.50 per sq ft, both broadly flat over the past five years.

What sets East London apart from the rest of Central London right now is the negotiating position of tenants. Rent-free periods on a typical ten-year lease in Canary Wharf and Wood Wharf run to 26 to 32 months, with rent discounts of 4.0% to 7.0% on advertised rates. By comparison, Mayfair and St James’s offer 20 to 24 months rent-free with discounts of 0% to 3%. For occupiers prepared to look beyond the traditional core, Canary Wharf in particular offers a substantial value gap: total annual occupancy costs (rent, business rates and service charge combined) for new mid-rise Grade A space sit at around £94.25 per sq ft, compared to £143 in the City Core and £262.50 in Mayfair / St James’s.

Larger deals have started to flow back into Canary Wharf. JP Morgan committed to an additional 148,000 sq ft at 1 Cabot Square in 2025, with BUPA and Barclays also taking expansion space at 50 Bank Street and 1 Canada Square respectively. State Street confirmed its prospective relocation from 20 Churchill Place to Helical and Orion’s 100 New Bridge Street, paying £333 million for the 194,000 sq ft scheme due to complete in Q2 2026 (Colliers, 2025). The Canary Wharf Group’s wider repositioning continues, with Wood Wharf adding 2 million sq ft of office space alongside residential, retail and life sciences uses, and the area is increasingly being marketed as a mixed-use community rather than a pure financial district.

The distinction between office grades has become even more pronounced in 2026, driven largely by ongoing energy efficiency regulations and a structural shift in occupier preferences.

Grade A and Grade B Rent

Grade A office space represents the highest standard in the current market. These are typically new or comprehensively refurbished buildings that meet strict sustainability criteria, such as BREEAM Excellent or Outstanding ratings and a strong EPC rating to align with proposed Minimum Energy Efficiency Standards (MEES) targets, which under current government proposals would require commercial properties to reach EPC C by April 2027 and EPC B by 2030 (CBRE). Modern Grade A offices include advanced features such as high-efficiency HVAC and ventilation systems with air-quality monitoring, superior natural lighting, and end-of-trip facilities including showers and secure cycle storage. This tier is in extremely high demand. 92% of all Q1 2026 take-up was Grade A, and 53% was in buildings rated BREEAM Excellent or Outstanding (Savills, Q1 2026).

The pricing premium for Grade A has widened significantly. Carter Jonas’s Q1 2026 data shows new and refitted Grade A space in prime City locations such as Bank and Leadenhall Street ranging from £82.50 to £105 per sq ft, with upper-floor tower space reaching £115 to £150 per sq ft. Grade B space in the same locations sits at £47.50 to £57.50 per sq ft, a discount of around 40 to 50% on prime (Carter Jonas, Q1 2026). The gap is even wider in Mayfair, where new Grade A space asks £155 to £210 per sq ft against Grade B at £80 to £90.

Grade B offices are typically older, second-hand spaces in non-prime locations, often lacking modern climate control, with lower energy efficiency ratings, and that may struggle to support the technological needs of a hybrid workforce. They offer a much more affordable entry point for smaller businesses or start-ups, but many Grade B buildings are now being repositioned, refurbished or converted to alternative uses as landlords prepare for tightening MEES regulations and weakening occupier demand. Savills forecasts Grade B rental growth of -1.5% in 2026 and 0% in 2027, before any modest recovery returns later in the decade as Grade A pricing forces some occupiers to compromise (Savills Q4 2025).

The market has bifurcated sharply. The flight to quality has driven vacancy rates for prime stock to extraordinary lows. Prime City tower vacancy stood at just 0.9% at the end of Q1 2026, with the average City tower vacancy at 2.9%. Mayfair vacancy contracted a further 50 bps in Q1 2026 to 3.4%, leaving just 12 months of supply at average take-up rates. By contrast, fringe submarkets such as Hammersmith (22%) and Vauxhall/Nine Elms (18%) carry significantly higher vacancy, almost entirely concentrated in older, less efficient stock that is increasingly difficult to let.

The Widening Gap between Prime and Super Prime Rents

London’s commercial real estate landscape in 2026 is defined by record-breaking divergence in value. While prime rents in core hubs have climbed significantly, a new tier of “Super Prime” pricing has emerged for buildings that offer exceptional sustainability and amenities. The City average prime rent rose 40% year-on-year in Q1 2026 to £130.80 per sq ft, with a new top rent of £160 per sq ft set at 1 Leadenhall, EC3. The West End averaged £165 per sq ft, with super-prime deals reaching £201 per sq ft at 77 Grosvenor Street, W1, acquired by SoftBank. The gap between City and West End prime rents has narrowed to its lowest level in over 25 years, a differential of just 21%, as occupiers compete for trophy assets across both markets (Savills, Q1 2026).

The separation between best-in-class and secondary stock continues to grow because the supply of high-quality space cannot keep up with demand. Overall Central London vacancy stood at 7.4% at the end of Q1 2026, but the picture is starkly two-speed. The City Core vacancy rate is 6.0%, 210 bps below its long-term average, and West End Core (Mayfair/St James’s) vacancy is 4.1%. Within the City, prime tower vacancy is just 0.9%. By contrast, fringe sub-markets such as Hammersmith (22%) and Vauxhall/Nine Elms (18%) carry far higher levels of availability, much of which is older stock that many modern occupiers no longer consider viable for hybrid working.

The post-pandemic recovery has matured into a structural re-pricing of the market. The financial, tech and legal sectors are driving this trend. Tech & Media narrowly overtook Insurance & Financial Services as the most active sector in Q1 2026, the first time in six years, accounting for 22% of take-up (boosted significantly by Databricks’ single 136,000 sq ft pre-let). Insurance & Financial Services followed at 21%, and Professional Services at 19% (78% of which was legal). Together these three sectors accounted for 62% of Q1 take-up. These occupiers are willing to pay significant premiums for buildings with the highest environmental ratings: 53% of all Q1 take-up was in buildings rated BREEAM Excellent or Outstanding, and 92% of total take-up was Grade A.

With around two-thirds of 2026’s expected 8.5 million sq ft of completions already pre-let, and viability pressures further trimming the post-2026 pipeline, the price gap between the “best” and the “rest” is expected to widen further over the next three to four years. Savills forecasts prime rental growth of 4.3% across Central London over the next four years, while Grade B rents are forecast to fall 1.5% in 2026 and stay flat in 2027 before any modest recovery returns later in the decade (Savills Q4 2025).

Key Trends and Shifts in London’s Office Landscape

1. A Turn Toward Premium, Amenity-Rich Office Spaces

The trend toward premium, amenity-rich office space has accelerated through 2026. Average West End prime rents now sit at around £165 per sq ft, with super-prime deals reaching £201 per sq ft in Mayfair, and the City average prime rent has surged to £130.80 per sq ft.

What occupiers are paying for has changed too. CBRE’s 2024 global workplace benchmarking data shows individual workstation space falling from 51% of total office space in 2021 to 40% in 2024, while dedicated amenity space rose from 11% to 17% over the same period. Hybrid and desk-sharing models grew from 12% to 36% of organisations. The shift away from rows of fixed desks toward more shared, varied space is increasingly built into the design of new buildings, not just retrofitted into existing ones.

105 Victoria Street is a strong example of where this is heading. The 500,000 sq ft Welput scheme, designed by KPF and Henning Larsen, dedicates 89,000 sq ft to amenity space and 30,000 sq ft to green space and terracing, the largest of any commercial building in the West End. The amenity programme includes a 200m “walk and talk” track, an urban farm with community allotments, a multi-purpose sports arena, a gym, and a Village Square at street level. The building is targeting BREEAM Outstanding and WELL Platinum certifications and is designed to use 65% less energy than a traditional office (Skanska).

This is no longer a niche trend. 53% of all Q1 2026 take-up was in BREEAM Excellent or Outstanding buildings, with 92% of Q1 take-up in Grade A space overall. Occupiers are paying significant rent premiums to secure buildings that can support recruitment, retention and ESG targets, with meditation rooms, end-of-trip facilities, outdoor terraces, concierges and rooftop bars now treated as expected features rather than additions.

2. Canary Wharf’s Comeback

The narrative around Canary Wharf has shifted radically. Two years ago, Docklands was routinely described as a district in decline. HSBC announced its move to St Paul’s, Clifford Chance had already left for the City, vacancy rates were rising, and most commentary (this guide included) questioned whether the area could maintain its status as Europe’s most recognisable financial district.

That picture has now reversed. The headline announcement is JP Morgan’s plan for a new 3 million sq ft EMEA headquarters tower at Riverside South, designed by Foster + Partners, that will overtake 8 Canada Square as the tallest building in the Docklands. The scheme will accommodate up to 12,000 staff, represents an investment estimated at £3 billion, and is one of the largest single office commitments made in Britain for more than a decade (Construction Enquirer, April 2026).

JP Morgan has been adding to its Canary Wharf footprint in steady increments alongside the new tower plans. The bank took 150,000 sq ft of overflow space at One Cabot Square (the former Credit Suisse HQ) in July 2025 and is in talks to take a further 85,000 sq ft on the third and fourth floors. The expansion has been driven by a five-day return-to-office mandate from March 2026 and over-capacity at the existing 1 million sq ft tower at 25 Bank Street (CoStar).

JP Morgan is far from alone. Even HSBC, the symbol of the original exodus narrative, has signed a 15-year lease on 11 floors at 40 Bank Street after its new St Paul’s HQ proved too small. Deutsche Bank has taken 250,000 sq ft, Visa is planning a headquarters move, Revolut has chosen the estate as its global HQ, and BlackRock is reportedly eyeing 8 Canada Square ahead of HSBC’s 2027 vacancy. Other recent commitments have come from Barclays (£150 million fit-out), Citigroup (a refurbishment of 25 Canada Square approaching £1 billion), Morgan Stanley (renewed for 14 years), BBVA, Hershey’s, Zopa, Citi and Fitch.

The diversification story is real, even as the financial sector returns. Construction is well underway on One North Quay, a 23-storey, 823,000 sq ft vertical campus that will be the largest commercial life sciences building in Europe when it completes in 2027. Designed by KPF and developed by Canary Wharf Group with Kadans Science Partner, the building will dedicate up to 60% of its space to wet laboratories and target BREEAM Outstanding and WELL Platinum certifications. Across the wider estate, the resident population now exceeds 3,500, with 2,300 apartments built and another 2,300 under construction, alongside 350+ shops, restaurants and bars and 16.5 acres of green space.

As Canary Wharf Group CEO Shobi Khan put it after the JP Morgan announcement:

It marks a defining moment for Canary Wharf and underlines its position as the destination of choice for the world’s most ambitious and innovative companies. We continue to attract and retain the very best who are drawn to our vibrant community, unrivalled connectivity, and world-class amenities.

The lesson for occupiers is straightforward. Canary Wharf and Wood Wharf still offer materially better value than core central London (total occupancy costs for new Grade A space sit around £94 per sq ft versus £143 in the City Core and £262.50 in Mayfair), with rent-free periods of 26 to 32 months on a typical ten-year lease. The “exodus” narrative was real for a while. The reversal is just as real, and is now being reflected in the volume of major lettings flowing back into the estate.

3. The Rise of Mixed-Use, Walkable Districts

Occupier preference has shifted decisively toward locations that feel like neighbourhoods rather than just office addresses. Mayfair vacancy fell another 50bps in Q1 2026 to 3.4%, with just 12 months of supply at average take-up rates, and West End Core vacancy sits at 4.1% (Savills, April 2026). The reasons are now well established. Tenants want shops, restaurants, green space, transport links and residential life on the doorstep, and they pay a premium for it.

Knight Frank’s Walkability Index ranked the West End, City Core, Southbank and Canary Wharf as London’s strongest mixed-use submarkets, measuring proximity to retail, F&B, education, green space, and transport. The same trend is visible in major regeneration zones. King’s Cross has matured into one of London’s most active tech and life sciences clusters, with Google DeepMind, Meta, Synthesia, Wayve, Isomorphic Labs, the Francis Crick Institute and the Alan Turing Institute all clustered around the station. Battersea, Canada Water, Brent Cross, Earls Court and Euston are following similar models, combining office, residential, retail, leisure and transport in single masterplans rather than separating them by zone.

Canary Wharf’s transformation is the clearest example of this shift in real time. The estate now hosts more than 3,500 residents alongside 350 shops, restaurants and bars, 16.5 acres of green space, 2,300 apartments built (with another 2,300 under construction), and a growing life sciences cluster. The point is that traditional financial districts have not died. They have evolved into mixed-use neighbourhoods, and the ones that have done it well are now seeing vacancy fall and rents rise.

4. The Real Vacancy Story

The headline figures hide a sharply two-speed market. Central London vacancy stood at 7.4% at the end of Q1 2026, but the spread between core and fringe submarkets has rarely been wider. The City Core sits at 6.0% (210bps below its long-term average) and West End Core at 4.1%, with prime City tower vacancy at just 0.9%. Mayfair has 3.4% vacancy, and Canary Wharf availability has fallen below 10% for the first time since 2018, down from around 23% two years ago (CoStar, via Workplace Insight).

The genuine vacancy challenge sits in fringe submarkets, where vacancy is concentrated in older, less efficient stock. Hammersmith Q1 2026 vacancy stood at 22%, with Vauxhall/Nine Elms at 18%. Hammersmith has actually improved by 4% over the past year, but only because some buildings were withdrawn from the market for change-of-use planning consent rather than because they were let. The story is not one of district-wide decline but of building-by-building obsolescence. The risk for occupiers and investors is in mistaking the headline 7.4% rate for an even spread, when in practice almost all of it sits in older Grade B stock that the market is steadily writing off.

5. London as a Global AI Hub

The single biggest occupier story of the past 12 months has been the surge in AI lettings. AI-linked companies have leased over 1 million sq ft in London since the start of 2025, around 7% of all lettings during that period (Knight Frank data, via Bloomberg). The geography is highly concentrated.

The marquee deals all completed in the past year:

• Anthropic signed a 158,000 sq ft lease at British Land’s 1 Triton Square in Regent’s Place, with capacity for around 800 staff (roughly four times its current UK headcount). The building is now nearly fully leased.
• OpenAI signed an 88,500 sq ft lease at Nan Fung’s Regent Quarter in King’s Cross, accommodating up to 544 staff and committing to London as the company’s largest research hub outside San Francisco.
• Databricks pre-let the entire Network Building in Fitzrovia (around 136,000 sq ft) from Derwent London, quadrupling its London footprint.
• Microsoft took Soho’s Film House in May 2026 to anchor a London AI presence, with a larger HQ search reportedly underway at three times that footprint.

The cluster effect has compounded. King’s Cross now sits next to Google DeepMind, Meta, Synthesia, Wayve, Isomorphic Labs and the Francis Crick Institute, and is described by venture firms as the third most productive technology cluster in the world after the Bay Area and Beijing. CBRE estimates AI companies could absorb close to half of all speculative office space currently under construction in London, with up to 4 million sq ft of AI-related demand forecast between now and 2033 (CBRE, via Business Matters). For occupiers and landlords positioning around this cluster, the practical implication is that rents and competition for adjacent space are likely to keep rising in the King’s Cross/Euston/Fitzrovia corridor over the next 18 to 24 months.

6. EPC Regulations and What They Actually Require

Energy efficiency regulations are reshaping the supply side of London’s office market, but the picture is less settled than many guides suggest. The current minimum standard for letting commercial property in England and Wales is EPC E, which has applied to new leases since April 2018 and to continuing leases since April 2023. Properties below this rating cannot be let unless an exemption is registered.

Beyond that, the position is still at the proposal stage. The previous government consulted on raising the minimum standard to EPC C by April 2027 and EPC B by 2030, but no final decision has been made and the implementing regulations have not yet been laid before Parliament. CBRE notes that based on government statements, the EPC B deadline is now expected to land “after 2030 but before 2035” rather than on the original 2030 timeline (CBRE). The interim 2027 EPC C milestone may also slip.

That uncertainty matters less than it might seem, because the market is moving ahead of the regulations. Lenders, investors and major occupiers are already pricing in a future where buildings below EPC B are difficult to let or refinance. The result is heavy capex flowing into refurbishments now, with 73% of new development starts in 2025 being extensive refurbishments rather than new builds (Savills, Q3 2025). Buildings that cannot make the upgrade economically are being repositioned for change of use, conversion to residential, or in some cases demolition and rebuild.

7. The Green Premium and Stranded Assets

The financial case for sustainability is no longer theoretical. Knight Frank’s 2021 Sustainability Series, conducted with BRE using a hedonic regression model on transaction data from over 2,700 Central London office buildings, identified clear rental premiums for high-end BREEAM-rated buildings.

• BREEAM Very Good: 3.7% rental premium
• BREEAM Excellent: 4.7% rental premium
• BREEAM Outstanding: 12.3% rental premium

The Outstanding rating is achieved by less than 1% of assessed buildings, which is part of why the premium is so high. The study also identified other rent-positive factors including proximity to public transport, building grade, floor count, nearby green space, and walking distance to a National Rail station.

The 2026 picture has reinforced these findings. 53% of all Q1 2026 take-up was in BREEAM Excellent or Outstanding buildings, and 92% was Grade A overall (Savills, Q1 2026). Investor pressure, occupier ESG commitments, and the prospect of regulatory tightening have all pulled in the same direction. Occupiers in financial services, law and tech are willing to pay double-digit premiums for buildings that align with their corporate climate targets, and lenders are now reflecting building energy performance in their underwriting.

The corollary is the rise of the “stranded asset” problem. Buildings that cannot economically reach EPC B and BREEAM Excellent are increasingly difficult to let to top-tier tenants, harder to finance, and trading at heavy discounts. Savills currently forecasts Grade B rental growth of -1.5% in 2026 and 0% in 2027, before any modest recovery returns later in the decade (Savills Q4 2025). For owners of older stock, the choice is increasingly stark: invest now in deep refurbishment, accept declining rents, or reposition the asset for a different use entirely.