Maine Township issued the following announcement on July 23.
Assessor Krey announces Maine Township residents may file an appeal to the Cook County Board of Review from August 1 through August 30. During the appeal period, my office will assist residents in filing a complaint through August 30, 2018. However, if any supporting documents are required to be filed with the Cook County Board of Review, all documents need to be to the Maine Township Assessors Office on or before August 24th to ensure it is processed timely to the Board of Review.
Original source can be found here.