Seoul apartment prices rose for an 85th consecutive week, matching the longest streak on record, while the capital’s luxury market weakened after the government announced a tax overhaul plan early last month. Seoul apartment sale prices increased 1.13% in September from August, but the KB Leading Apartment 50 Index, tracking the 50 most valuable complexes, fell 0.22% to 99.2. Cheaper outer districts led Seoul’s gains, Gyeonggi accelerated, and the three Gangnam districts continued to decline.