Castlereagh opened in 1983 and since then has amassed a wealth of knowledge and expertise in all aspects of the central London property business. In doing so we have built up a reputation for our friendly, efficient and professional service that is the envy of our competitors. The company began life in residential lettings. As the business expanded, we moved into property management and later opened a residential sales department dealing mainly with overseas investors. Our management portfolio consists of around 220 units all situated in west-central London, and especially W1H and W1.