The review, carried out by property services consultants DTZ, began in August 2012.

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Rents for grade A office buildings has been on the rise due to tight supply and good demand, according to a report by brokerage DTZ.

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Private equity groups seeking deals have targeted 20% to 60% discounts on the loan sales, buying collections of low-quality, performing and non-performing loans, according to DTZ.

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The RBS-Blackstone deal was done at a 30% discount to the loans' value, according to DTZ research, and the bank's March sale of troubled Spanish loans to Perella Weinberg Partners sold at a 45% discount.

WSJ: Love Among the Ruins