Helical plc is a United Kingdom-based property investment and development company focused on office buildings in central London. The company operates through two segments, Investment properties and Development properties; the Investment properties segment comprises buildings owned or leased for long-term income and capital appreciation, while the Development properties segment includes sites, developments under construction, completed developments available for sale, and pre-sold developments. Its portfolio features key assets such as The Bower, a 334,000 sq ft office campus in EC1; 100 New Bridge Street, a 194,500 sq ft headquarters building in EC4; Brettenham House, a 128,000 sq ft refurbished office in WC2; 10 King William Street, a 142,000 sq ft new-build office in EC4; The Loom in E1; and additional schemes in Paddington W2 and Southwark SE1, including a 429-unit purpose-built student accommodation project; the company targets best-in-class, sustainable office space with high amenity, alongside pivots to alternative uses like student housing where optimal. Founded in 1919 and headquartered at 22 Ganton Street, London W1F 7FD, Helical plc generates revenue from rental income, development profits, and asset sales primarily in the UK real estate market, serving corporate occupiers in finance, technology, and professional services. Recent developments include the forward sale of 100 New Bridge Street to State Street Corporation for £333 million (£166.5 million Helical share) completing in April 2026, the largest London office transaction of 2025; agreements with Places for London to forward fund the Southwark SE1 student accommodation and a 55,000 sq ft Farringdon office planning submission; enabling works commenced on the 235,000 sq ft Paddington office scheme with construction starting Q1 2026 and financing credit-approved; full refurbishment of Brettenham House targeting Q3 2026 completion; and 10 King William Street on track for December 2026 practical completion, all delivering 464,500 sq ft of new and refurbished space into a supply-constrained market; the company continues pursuing equity-light joint ventures, including potential purpose-built student accommodation near White City Tube station.