315 ILCS 20/20
Upon application in writing filed by a Neighborhood Redevelopment Corporation with the Redevelopment Commission for an extension of the time limit within which to initiate or to complete the Development, or both as the case may be, pursuant to the certificate of convenience and necessity possessed by the Neighborhood Redevelopment Corporation, the Redevelopment Commission shall hold a hearing and shall examine into the said application and the reasons for the failure to initiate or complete the Development, or both as the case may be, within the time limit originally allotted therefor, which reasons shall be stated in detail in the application, and the Redevelopment Commission, if satisfied that the failure was not occasioned by purposeful non-exercise, without excuse, of the authority contained in the certificate of convenience and necessity, shall grant such extension or extensions of the said time limits as the circumstances of the case may require. Nothing herein contained shall be construed to debar a Neighborhood Redevelopment Corporation from making applications for successive extensions of the time limits.
If the Redevelopment Commission shall grant an extension or extensions of the time limits, as in this Section provided, the secretary of said Redevelopment Commission shall notify in writing the surety or sureties upon the bond of the Neighborhood Redevelopment Corporation, filed pursuant to subparagraph (a) of paragraph 2 of Section 17 of this Act, of the fact and duration of the extension or extensions. Every such bond made by such surety or sureties shall be subject to the power and authority of the Redevelopment Commission to authorize the extension or extensions, and no surety shall be discharged by reason of failure of notice or knowledge of the extension or extensions.
315 ILCS 20/20