The former offices of Ordnance Survey are situated in London Road, Southampton, close to the junction with The Avenue, and are now part of the city's court complex and are occupied by government agencies.

Ordnance Survey originally came to Southampton on 12 November 1841, a fortnight after a fire had destroyed its headquarters in the Tower of London.

By May 1969, the vast majority of staff had moved to the new, 'permanent', purpose-built headquarters complex in Maybush; when Ordnance Survey vacated the London Road site.

Most of the remaining buildings are occupied by various government agencies[8] in conjunction with the modern court complex built on the northern part of the site, including the Crown Prosecution Service,[9] and previously by the Official Receiver[10] (who is now based in Commercial Road).

The remaining buildings date from between 1866 and 1872, and comprise the barrack block, the staff quarters and the Western Range, all of which were designed by Major General Sir Henry James (1803–1877), who was then Director-General of Ordnance Survey.

It comprises two main sections at a slight angle to each other to accommodate the curve of Carlton Crescent, onto which it backs, and the slope of the site.

At the southern end of the site is the former "Staff Quarters", a two-storey building in four sections, having seven windows in all at each level, some of which are blank.

The property was first let to Thomas Leader Harman, a local Liberal politician and proprietor of the Hampshire Independent weekly newspaper.

[15] By the door is a blue plaque in memory of Major General Sir Henry James, Director-General of the Ordnance Survey who live here until his death in 1877.