I was lucky enough to get to meet the Substantial team while in Seattle. It was one of the best designed spaces I've been to, with a strong imprint from the Substantial staff. The DJ booth isn't just for show, 6 of the substantial staff are DJs. There acoustic knowledge helped build an acoustically perfect meeting room; I'm jealous.
Do you have a cool office? Let firstname.lastname@example.org know, I can visit offices in SF anytime and I'm always happy to travel to check out interesting spaces.