The developer will submit plans to Islington Council for the Kohn Pedersen Fox designed building at 99 City Road within the next few weeks.

New building will offer around 480,000 sq ft of office space and a 3,000 sq ft great room for conferences and public use.

The site is presently the headquarters of satellite communications group Inmarsat, which is planning to vacate the existing 1980s office building at the site.

Existing 10-storey Inmarsat HQ office building

This building will be partially demolished with around 60% of the existing building structure retained to reduce concrete use and shorten the construction programme.

The majority of the existing building’s structure will be retained, including the foundations and basement. A retain-first approach provides an adaptable workplace while reducing embodied carbon and construction traffic. A new core will be inserted and additional floors added to create a hybrid old/new structure.

The planned replacement tower will rise to around 160m and widen the pedestrian area around the site. It will also introduce green terraces and a winter garden at street level.

New tower will have a terracotta and glazed facade