The site is on the corner of Marylebone Road in London's wealthy Westminster, and is likely to need funding of around £35-£50 million.
Martin Wittekind, of HMCS estates division, said: 'We are hoping to consolidate three existing courthouses on the chosen site. On the site are two existing buildings which, although not listed, are buildings of interest.
'We would like to knock down one - a Victorian bath house - and keep the facade of the other, which is Marylebone's original county court.'
The estates division also owns a tower block next door, so we would like to combine both sites, creating a high-quality landmark building, which would act as a gateway to the Portland conservation area.'
The HMCS hopes to create a shortlist of eight architects in November, which will then be whittled down to three.
The building is expected to be completed in early 2010.
For more information visit www.ted.europa.eu, ref 2006/S 149-160619.