Not to be too critical, but if you are asking this question this is a possibility you are feeling pressured to get an office because "that's what professional people do" and not because it actually provides much tangible value. Get an office if you NEED one but make sure you absolutely have no other option (find contract/telecommuters/etc)... An office can seriously affect you burn rate which is usually bad news unless you have a clear path to profitability.
Great question, but no. I have been doing the non-office thing for almost a year. I have 35 contractors working from me off-site. But my business has hit a point where I need to hire two full-time people (to keep it running) and my partner is soon going to be joining me....so we need a space.