It acquired a former gaol (built 1791–1794) immediately south-east of the Sessions Room and County Hall, and converted that to be offices.

[5] The county council's administrative responsibilities continued to grow, and by the early 21st century its offices were spread across some twelve buildings around the town.

In 2013, it decided to procure a single administration centre in which council officers and their departments would be co-located on a derelict site just south of County Hall.

[6] The building was designed by BDP, built by Galliford Try[7] at a cost of £53 million and officially opened by the Secretary of State for Housing, Communities and Local Government, Sajid Javid, in October 2017.

[8][9] The county council subsequently announced the sale and lease back of One Angel Square to Canada Life Investments, in order to raise funds for the provision of services, in February 2018.