At the time, the Cabinet Office estimated up to £31 billion would be generated in economic benefits by the programme which aimed to build civil service career pathways outside of London by moving 22,000 roles out of the capital by 2030.
Article source: https://www.huffingtonpost.co.uk/entry/jacob-rees-mogg-to-sell-off-ps15bn-of-government-london-offices_uk_630b2963e4b07744a2f7bdc9