Credit Suisse First Boston said Wednesday that it had restructured its commercial mortgage unit in the wake of the fall's global economic crisis.

The investment bank has renamed its Principal Transactions Group the Real Estate Products Group and placed managing directors Stewart Dauman and Karen Zimmerman in charge.

Andrew D. Stone, the well-known investment banker who ran the old group since 1995, will stay on as chairman, overseeing the transition and gradually liquidating a portion of its real estate portfolio, which is believed to be between $8 billion and $9 billion.

Credit Suisse was a leader in the commercial mortgage conduit business, making real estate loans, warehousing them on its balance sheet, and ultimately reselling them as securities.

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