The site is owned by Newcastle Estates Partnership and the principal tenants are His Majesty's Revenue and Customs (HMRC) and the Department for Work and Pensions (DWP).

The DWP and its various agencies, including the Pension, Disability and Carers Service, Jobcentre Plus and the Health and Safety Executive also have staff based at the site.

All of the original buildings were demolished, replaced by a series of sixteen contemporary structures, built in grey metal and glass.

The new buildings provide open plan office space with kitchen facilities, showers, shops selling drinks, snacks, and newspapers, and seating areas for both formal and informal meetings.

The site was created with the founding of the UK welfare system in the late 1940s and consisted of a series of 'H Blocks, So named due to their similarity to the letter 'H' when viewed from above.

The ‘H’ blocks are believed to have been built as a hospital accommodation for wounded servicemen from World War II, although the buildings were never used for this purpose.

The plinth now stands at the centre of a small outside seating area at the rear (or western) end of the site.