70 ILCS 2405/22a.19
Any person interested in any real estate to be affected by an assessment may appear and file objections to the report by the time mentioned in the notice or within such further time as the court may allow.
As to all lots, blocks, tracts and parcels of land to the assessment of which objections are not filed within the specified time or such other time as may be ordered by the court, default may be entered, and the assessment may be confirmed by the court notwithstanding the fact that objections may be pending and undisposed of as to other property. Such order of partial confirmation shall be final and appealable with respect to the property as to which the assessment is confirmed.
It shall be no objection to confirmation of the assessment roll that some or all of the lots, blocks, tracts, and parcels of land of the assessment lie outside the then existing corporate boundaries of the district at the time confirmation is sought, provided that at the commencement of the project a portion of the project area is included in or contiguous to existing district boundaries, and at the completion of the project, all of the lots, blocks, tracts, and parcels of land not within the corporate boundaries of the district at the commencement of the project are served within the meaning of Section 23.5 of this Act, and provided further that persons interested in such real estate may assert any other objection they may have in connection with the special assessment project, including without limitation that the property is assessed more than it is benefitted by the improvement or that there is no benefit at all to their property. Where any of the properties contained in a special assessment project lie outside of, but contiguous to, the corporate boundaries of the sanitary district, the Committee of Local Improvements may not commence the project without receiving a written petition requesting the project signed by at least a majority of the affected landowners, their agents, or assigns.
70 ILCS 2405/22a.19