Reuters/Ki Price France's Unibail-Rodamco has agreed to buy shopping mall owner Westfield for $15.7 billion. Westfield owns and operates 35 shopping centers in the US and United Kingdom. Including debt, the deal would be worth $24.7 billion. (Reuters) - France's Unibail-Rodamco has agreed to buy shopping mall owner Westfield Corp for $15.7 billion, in what would be the biggest takeover of an Australian company on record. The deal accelerates consolidation of the global retail property sector as it grapples with challenges from online retailers led by Amazon.com Inc.