One of James Stirling's earliest buildings has been upgraded from Grade II to Grade II*-listed status.
The Brutalist Langham House Close apartment block scheme at Ham Common, Richmond, Surrey, has received the upgrade.
The project was one of Stirling's first, designed when he worked under the banner of architectural firm Stirling and Gowan.
Twentieth Century Society director Catherine Croft said that she was excited that the scheme was being awarded further recognition.
'This group of three blocks of flats, built in 1957-8, is an early masterpiece,' she said.
'They were elegantly squeezed into the long narrow site of a Georgian manor house. From the outside, the buildings try to fit in with the older building by using the same colour of bricks, but at the same time they use Modern forms and lots of exposed concrete elements.
'The flats themselves are striking, with ingenious floor plans and geometric concrete fireplaces,' she added. 'They still look very modern and are exciting spaces in which to live.'
And a further upgrade has been awarded to the 1930s Art Deco Café Matthiae on the Kew Road, west London, the architect of which is unknown, which has made it to Grade II-listed status. by Ed Dorrell