The prices went down by 0.3 per cent in Greater Helsinki and by 1.2 per cent in the rest of Finland.
Compared with the corresponding period of the previous year, the prices fell by 1.5 per cent in the whole country, the data show.
In Greater Helsinki, as well as in the rest of Finland, prices went down by 1.5 per cent year-on-year.
In January, the average price per square metre of an old dwelling in a housing company was EUR 2,216 in the whole country, EUR 3,540 in Greater Helsinki and EUR 1,696 elsewhere in the country.