Yes there is a fast growing market for shared office spaces, some of the numbers are illustrated on their website https://primalbase.com
WeWork for example started in 2010 with one office space in New York and today they are valued at $16 Billion https://en.wikipedia.org/wiki/WeWork
Yes office sharing is often used by start-up companies because they get a fixed cost, they don't have to commit long term and they are surrounded by other creative entrepreneurs so it's a great motivating/exciting/fun environment where ideas are shared & where valuable relationships/partnerships are often made.
(If you meant a market/exchange where you can buy it, it is currently on the Waves exchange but hopefully they will announce bigger exchange soon.)
Thanks, I don't trust numbers on the pages where I invest to So wanted to have some other opinion.