To assist the ailing Metropolitan [[Ireney (Bekish) of New York|Ireney (Bekish)]], the [[primate]] of the now Orthodox Church in America, Abp. Sylvester was appointed by the Holy Synod as temporary administrator of the OCA on [[May 15]], 1974, to assist the Metropolitan in his duties until his retirement and election of a new metropolitan. The election of Metr [[Theodosius (Lazor) of Washington|Theodosius (Lazor)]] took place at the fifth All-American Council on [[October 25]], 1977.
As he advanced in age, Abp. Sylvester decided to relinquish his [[hierarch]]ical responsibilities to new, younger leadership. He retired on [[July 1]], 1981, and for the years following served as pastor of Ss Peter and Paul Cathedral in Montreal. Abp. Sylvester died on [[May 18]], 2000. His funeral was held at Ss Peter and Paul Cathedral according to the rites for monastics, with Bp. Seraphim of Ottawa and Canada celebrating. He was buried at St. Seraphim Cemetery in Rawdon, Quebec.