From the CREA:
Home sales via Canadian MLS® Systems dropped sharply in January after having climbed to the highest monthly level on record in December. Although activity retreated to the lowest monthly level in three years, January sales were on par with the 10-year monthly average.
Activity in January was down in three-quarters of all local markets in Canada, including virtually all major urban centres. Many of the larger declines in percentage terms were posted in Greater Golden Horseshoe (GGH) markets, where sales had picked up late last year following the announcement of tighter mortgage rules coming into effect in January.