40 Leadenhall, London

40 Leadenhall: A new landmark development in the City of London

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Image source: Make Architects

40 Leadenhall is one of the most ambitious commercial developments ever approved in the City of London. Situated in the heart of the City's insurance district, this landmark project offers over 900,000sqft of premium office space, accommodating up to 10,000 professionals. Featuring best-in-class amenities, including restaurants, bars, a fitness centre, a wellness suite, a clubhouse and  dedicated event spaces, 40 Leadenhall sets a new benchmark for modern workspaces.

Demolition began in 2019, and the base build was completed in 2024, with final fitouts continuing through 2025 to ensure a phased, strategic approach to tenant occupancy. The site features two distinctive towers, 14 and 34 storeys respectively, offering world-class office accommodation. A key feature of the development is the careful restoration and seamless integration of the Grade II listed 19-21 Billiter Street building, originally constructed in 1865, into the overall scheme.

The project is now being widely recognised, having recently been named as the Best Commercial Workplace at the BCO Regional London Awards 2025. Overall, 40 Leadenhall stands as a testament to innovation in commercial office development, blending heritage with state-of-the-art design to create a future-proof workplace.

900,000

total sqft of premium office space

80,000

sqft

amenity space across the building

17

outdoor green spaces and terraces

14,000

sqft

central square, library and think space

WELL

Platinum

NABERS

5 star

BREEAM

Excellent

Gleeds project management team members have been instrumental in delivering this fantastic project, including employers agent services from the start of demolition, through to the completion of the base build. In addition, we played a crucial role in the landlord and tenant coordination.

Enhancing the building’s offering even further, Gleeds has successfully delivered landlord fitouts, adding to the amenity provisions. Additionally, we have executed turnkey Cat A&B office fitouts to support short-term letting requirements, allowing for flexibility within the development.

Sustainability

40 Leadenhall is designed to meet the highest sustainability and technology standards. The development has achieved:

  • WELL Platinum certification – prioritising occupant health and well-being
  • NABERS 5* – demonstrating exceptional energy efficiency
  • BREEAM Excellent rating – reflecting sustainable construction and operational practices
  • WiredScore and SmartScore certifications – ensuring best in class digital connectivity and smart technology integration.