That big whoosh you're hearing is the air rushing out of a commercial real estate bubble.

More than two years into the worst housing crisis in decades, commercial real estate is shaping up as the second half of what some are calling a “double bubble.” Owners of shopping malls, hotels, office space and apartment buildings — and the bankers who financed them — face a major crunch over the next two years as the mortgages on those properties start coming due.

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