Fraser Bond are the leading lettings and property management agents for HYLO - London EC1Y. HYLO is an office development near Old Street roundabout in London EC1. The 29-storey building will comprise 278,000 sq ft of office and retail space. Designed by HCL Architects with interiors by Stiff + Trevillion. Offices: 261,143 sqft of office space. Retail: 17,130 sqft of retail. Amenities: Over 11,000 sq ft in terraces across four floors providing multiuse spaces, for work, rest and play. Landscaped roof terraces, breakout spaces and dining areas, generous locker and shower facilities, as.