A row of skylights offering extensive views of London’s skyline influenced ODOS Architects’ design for Slack’s first UK offices, the creator of the workplace messaging system by the same name. Slack’s London office is located on the top two floors of the former BBC Radio 1 broadcasting building on Great Portland Street, and is the company’s second European base. The San Francisco-based company opened its first European office in Dublin in 2015, but relocated to a bigger space earlier this year in the capital. ODOS Architects, which has offices in London, Dublin and New York, also designed this space for the company.