AFAIK, it's just representative of status/power, but I don't know its origins.
A listing in The Urban Dictionary defines/describes it as: When an idea, movement or act has become very successful. To be propelled to great heights. [1]
FWIW, there's a band called The 39th Floor [2] that I like for its grungy/retro-ish rock. The band's name evokes, for me, the image of "high-powered execs", but I'm not sure how that association got into my head. (Possibly the track Koka Kola on The Clash's album London Calling [3], but that refers to a "51st floor", rather than 39th, to symbolise corporate success/power [4].)
A listing in The Urban Dictionary defines/describes it as: When an idea, movement or act has become very successful. To be propelled to great heights. [1]
FWIW, there's a band called The 39th Floor [2] that I like for its grungy/retro-ish rock. The band's name evokes, for me, the image of "high-powered execs", but I'm not sure how that association got into my head. (Possibly the track Koka Kola on The Clash's album London Calling [3], but that refers to a "51st floor", rather than 39th, to symbolise corporate success/power [4].)
[1] https://www.urbandictionary.com/define.php?term=39th%20floor
[2] https://the39thfloor.bandcamp.com/
[3] https://en.wikipedia.org/wiki/London_Calling
[4] https://genius.com/The-clash-koka-kola-lyrics