There's a category of mixed-use development popular in South Korea called officetels[1] that started more or less exactly this way. Newer ones can be pretty nice because there's a lot more care put into the design of the residential spaces, but the older ones that you can tell are converted offices are...not great, unless you're just a big fan of foamcore dropped ceilings.

1. https://en.wikipedia.org/wiki/Officetel