Me neither, I read this book a lot of times and it mentions the Renraku plex, but not describe anything.
Until the 2030s, Chiba was a quiet seaside suburb across the bay from Tokyo, but that all changed when Chiba-born corporate raider Inazo Aneki came home with his newest acquisition, a company named Keruba International. Th e world would know it as Renraku Computer Systems. Setting up Renraku’s global headquarters on the Makuhari waterfront of Chiba revitalized the area and brought in money, employment, research, and business. By the time Chiba was offi cially integrated into Neo-Tokyo in 2063, it was already a thriving city on the cutting edge of technological and medical research.
pg. 83, Talking about Chiba.
That's all the books mention it.... But anyway, any idea of a plex ambientation? I think in something like high security and antropomorphic drones receiving the guests of a party (which the runners will infiltrate to get informations).