今、気付きましたが、CICの説明、わかりにくいですね。もともとの移民法規則を載せておきます。
11. (1) An application for a permanent resident visa — other than an application for a permanent resident visa made under Part 8 — must be made to the immigration office that serves
(a) the country where the applicant is residing, if the applicant has been lawfully admitted to that country for a period of at least one year; or
(b) the applicant’s country of nationality or, if the applicant is stateless, their country of habitual residence other than a country in which they are residing without having been lawfully admitted.
http://www.canlii.org/ca/regu/sor2002-227/sec11%2Ehtml
つまり
(a)滞在国の管轄ビザオフィス(1年以上のビザがある場合)
(b)国籍国(無国籍の場合は合法的定住国)の管轄ビザオフィス
のどちらかということですね。