When Jamie Dimon, the chairman and chief executive of JPMorgan Chase & Co., finally sold his Gold Coast mansion at 25 E. Banks St. in 2010 after it was on the market three years, the real estate crisis prevented him from getting the more than $13 million he originally wanted.

But he did get help from JPMorgan, which paid $421,458 in expenses related to the sale, according to a Securities and Exchange Commission filing made public yesterday.

The expense payments, first reported by Bloomberg News, were part of a $20.8 million total compensation package Dimon received from JPMorgan in 2010. His pay package in 2009, in the wake of political fallout over federal bailouts of the major money-center banks, was $1.3 million, the filing said.

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