One of the challenges we face every time in architectural visualization is that you have to find or create furniture models that fit the context of your project, in order to give it the correct sense of scale to your 3d model. And for office spaces you should use office furniture. This morning I just spotted a nice office chair for download at BlendSwap that could be a really great addition to any architectural visualization artist working with Blender.
It is an Interstuhl silver office chair modeled by an artist called lekanus, and shared in Blendswap with a creative commons zero license.