definiens: means the consent of h _ ] in . writing which will not be unreasonably withheld or delayed and means a part of the Premises of at least rg1.~ ] square feet gross internal area which is ~~;&.IWWi'Mr&S@S(lf~'5Jl!£'iC',*m'·_J'M·.~tw'W1!Q'\);~'IJI · · · · ... w. ' ;, :, { . ' . . me~;£ildalini;e \tt.~ .'~C CY . ~ : .~ ] : ~%(JtW,{$ ( a ) Unless expressly permitted by this clause 5.17 not to rllff.mf€14 CONFIDENTIAL TREATMENT REQUESTED BY AVIRON [ I -CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, IS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES ACT OF 1934, AS AMENDED