Hotelling is a recent office management strategy. Instead of assigned desks each employee uses a different workspace every day. This allows the office to support people who are only in the office part time. Services like Beta House in Cambridge, Massachusetts offer desks specifically for high tech professionals starting at $225 per month.
Working parttime in a shared office like this also helps you stay connected with other professionals in your area. One member of Beta House told me he got many business contacts and his current job through the people he met in a shared office.