At any time prior to the Redevelopment of the Development Area, the Redevelopment Commission may approve an amendment to a Development Plan, but no such amendment shall be approved unless and until (1) an application therefor shall have been filed with the Redevelopment Commission by the Neighborhood Redevelopment Corporation to which a certificate of convenience and necessity has been issued in connection with the Development Plan sought to be amended, which application shall contain the portions of the matters required by paragraph 1 of Section 17 of this Act relevant to the proposed amendment; (2) the bond and written agreements required by paragraph 2 of Section 17 of this Act, if applicable to the proposed amendment, shall have been furnished the Redevelopment Commission; and (3) the Redevelopment Commission shall have determined that the proposed amendment fulfills such of the conditions prescribed by paragraph 3 of Section 17 of this Act as are relevant to the proposed amendment. The procedure relating to the determination of the Redevelopment Commission made pursuant to this Section shall be the same as is provided by Section 18 of this Act for the determination of the Redevelopment Commission upon an initial application for approval of a Development Plan.