Residential

Christie's Great Estates
Network of independent brokers specializing in the sale of luxury properties. View listings, find affiliates, or read the company profile.
http://www.christiesgreatestates.com/

Sotheby's International Realty
Full service luxury brokerage with offices and affiliates in Europe, North America, and South Africa. Includes searchable property listings, directory of offices, and details on the mortgage program.
http://www.sothebysrealty.com/

World Property Centre Group
Holiday rental and property management company with bases in the UK, Florida. Find out about services, places to let, houses for sale, and FAQ.
http://www.worldpropertycentre.com/