Vacancies in U.S. office buildings rose to 13.6% in the third quarter, from 13.1% in the second, the biggest quarterly jump since the second quarter of 2002, according to Reis Inc., a New York real estate research firm.

Asking rents rose 0.6%, the smallest gain since the second quarter of 2005, Reis said. Effective rents, or what tenants actually pay, did not grow at all last quarter.

The last time office rents failed to gain was the fourth quarter of 2004.

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