Blackstone Group is seeking to secure about $1.35 billion in loans to refinance debt on 21 office properties, Reuters reports. Insurance companies, MetLife and New York Life Insurance, will provide an $850 million senior mortgage to Blackstone. Sovereign wealth fund, Government of Singapore Investment Corporation, may also offer a mezzanine loan for about $450-500 million. Refinancing of the office buildings, which are mostly located in California, is expected to be completed by July 2011.

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