Westfield Group operates in the Real estate agents and managers sector. Westfield Group is a retail property group. The Company has interests in and operates a portfolio of 119 regional shopping centers in Australia, New Zealand, the United States and the United Kingdom, with almost 24,000 retailers in more than 10 million square meters of retail space. Westfield is a vertically integrated shopping centre group. It manages aspects of shopping centre development from design and construction through to leasing, management and marketing. It operates in three segments: Property investments, Property and project management, and Development. Property investments segment includes net property income from existing shopping centers and completed developments, revaluation of existing centers and other operational expenses. Property and project management segment includes external fee income from third parties and development fees, and associated business expenses. In October 2011, it sold 50% interest in the retail component of Westfield Stratford City (UK).