Boston’s office vacancy rate rose to 13 percent in the third quarter this year, a 40 percent jump year-over-year from Q3 in 2008, according to a report published today by Colliers International.

The vacancy rate increased from 9.3 percent in the third quarter of 2008 to 13 percent in Q3 ’09, according to Colliers.

The suburban market did not fare so poorly, rising 19 percent year-over-year in the third quarter to 19.5 percent, the report said.

Nationwide, office vacancies rose another half point during Q3 2009, coming in at 16 percent, Colliers said.

"Class A office buildings in downtown markets fared best in Q3, with 25 of the 56 markets surveyed by Colliers showing positive quarterly net absorption," the firm said in a press release. "Suburban markets were more lackluster, reflected by 18 of 55 suburban markets under study by Colliers with vacancy rates in excess of 20 percent."