International arbitration firm Three Crowns signs new 15 year lease at Helical and Ashby Capital's JJ Mack Building

15 March 2024

International arbitration firm Three Crowns signs new 15 year lease at Helical and Ashby Capital's JJ Mack Building.


Helical plc and Ashby Capital have let the eighth floor comprising 15,484 sq ft of best-in-class office space at The JJ Mack Building, 33 Charterhouse Street, EC1 on a 15 year lease to Three Crowns, a leading international arbitration law firm. The firm plans to relocate from its existing offices at New Fetter Place in early 2025.  


The recently developed building provides a total of 200,611 sq ft of office space across 11 floors, alongside 5,439 sq ft of ground floor retail. It is rated EPC A and is anticipated to receive both a BREEAM Outstanding rating and a NABERS 5* assessment for energy in use. Incorporating market-leading technology within the building enables tenants to easily manage their ambient environment. Tenant amenities include 426 cycle spaces and high-quality showers and changing rooms.


This letting comes shortly after it was announced that J Sainsbury has taken the first, second, and third floors of the building, comprising 68,002 sq ft. With the sixth and seventh floors, totalling 37,880 sq ft, let to Partners Group and the 13,408 sq ft ninth floor let to Corio Generation, part of the Macquarie Group, The JJ Mack Building is now 67% occupied.  


The building takes its name from the grocery store formerly located on the corner of the site, owned by JJ Mack, a market trader whose career started with just a street barrow. It sits opposite the Victorian Smithfield Markets Building, which is undergoing extensive refurbishment and restoration to become the new Museum of London. Farringdon Station, one of the best-connected stations in London following the opening of the Elizabeth Line, is just 150 yards away.


Hugh Carlson, CEO of Three Crowns, said: “We at Three Crowns are delighted to be relocating to the JJ Mack building in 2025.  We look forward to welcoming our colleagues and clients to this sustainable, accessible, and modern workplace.”


Gerald Kaye, Chief Executive of Helical plc, commented: “The addition of Three Crowns to our tenant roster takes The JJ Mack Building to over 67% let, with strong interest in the remaining space. Coming so soon after we let three floors to J. Sainsbury, today’s announcement further highlights the continued strong demand for high quality office space, and the widening gap in the market between best in class properties and the rest.”


Peter Ferrari, Chief Executive of AshbyCapital, said: “Hot on the heels of our significant letting to J Sainsbury, we are excited to welcome Three Crowns to The JJ Mack Building. This lease demonstrates the building’s sustained appeal and is testament to its high-quality design, strong sustainability credentials, extensive amenities and excellent location. We are confident that Three Crowns will benefit from the step change in quality and lifestyle that their new workplace offers, and we look forward to welcoming further tenants in the coming months.”


Helical and Ashby Capital were advised by CBRE and Knight Frank and lawyers Clifford Chance; Three Crowns by Cushman and Wakefield and Bristows.

For further information:

  • Gerald Kaye
    Helical CEO
    Tel 020 7629 0113
  • Tim Murphy
    Helical CFO
    Tel 020 7629 0113
  • Dido Laurimore/ Richard Gotla
    FTI Consulting
    Tel 020 3727 1000