Allegheny County assessors have fallen behind in assessing commercial properties, according to a supervisor with the firm overseeing the county's reassessment program.

Two assessors resigned and two others were fired, Wesley Graham said during a meeting Tuesday to update Common Pleas Judge R. Stanton Wettick on the progress of the program. Graham said he hopes to have the remaining 15,085 assessments completed in November.

Wettick previously ordered the reassessment staff to devote nearly all its resources to Pittsburgh assessments so that the city and school district won't have to borrow money. Some municipalities and school districts are concerned they won't have proper information in time to set their 2012 tax bills