Atlanta-based architect and developer John C Portman Jr, renowned for his buildings designed around vast atria, has died aged 93.
Portman's architecture firm made the announcement the day after his death on 29 December 2017, which was followed by a string of tributes from the international architecture community.

Thank you John C Portman for bringing spatial awe to my Atlanta youth and thus paving the way for my own architectural adventure. pic.twitter.com/nwsubzcUHZ
? kai-uwe bergmann (@kaiuwebergmann) December 30, 2017

The architect's best-known projects include hotels like the Atlanta Marriott Marquis, and Hyatt Regency branches in Atlanta and San Francisco ? each laid out around soaring internal atria.
John C Portman Jr's notable buildings include the GM Renaissance Center in Detroit He also designed the Renaissance Center in Detroit, which comprises interconnected skyscrapers that stand prominent on the city's skyline, and included the tallest hotel in the western hemisphere until it was surpassed in 2013.
Portman designed many hotels across the US, including the Hyatt Regency Atlanta. Photograph by Michael Portman
Portman was also a prolific developer, and made great efforts to save the downtown areas of his home city and other American metropoles during the so-called "white exodus" to the suburbs in the second half of the 20th century.
His contribution to the skyline of Atlanta included the multi-block Peachtree Center. Photograph by Kinka Wong
This resu...