Redgate in the UK do (or did... i don't know if they still do) this for small startups. I went for an interview there once and in one corner of the main office

Redgate in the UK do (or did... i don't know if they still do) this for small startups. I went for an interview there once and in one corner of the main office was an area with a few desks where 3/4 person startup was just getting going. This was in 2009 so they may not have the spare capacity now, but it's certainly been done.