. . . Dulles Corridor vacancies are one of the factors keeping vacancy rates in the region up. By the midway point of 2010, the Washington office market had a vacancy rate of 12.8 percent, fourth lowest in the nation but up from the year before, according to Delta Associates, a research firm. Comparatively, vacancy rates in Reston and Herndon ranged between 15 and 18 percent in the second quarter. . . .
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