Mass residential prices in the secondary market fell more than 30 per cent in the first half, according to Midland Realty.
It said second-hand luxury flats also fell by about 40 per cent in the half, narrowing the gap between mass and luxury properties.
The figures were based on transactions registered with the Land Registry and a company survey covering 50 popular private housing estates and 20 luxury residential developments.
Midland said mass flat prices in July averaged $3,675 per square foot, 32.7 per cent lower than those reported in January, or 40.8 per cent down, compared with July last year.
Luxury prices in July averaged $6,169 per sq ft, 39 per cent below the January level and 49 per cent lower than July last year.
Midland said the gap between mass and luxury prices narrowed to about 40 per cent, from 54 per cent previously.