SINGAPORE continued to attract international companies, but not even its healthy office leasing market could keep pace with the rate of new construction. According to the latest edition of Colliers Jardine's Asia Pacific Trends major lettings during the December quarter included a little less than 50,000 square feet to a major international finance institution, 30,000 sq ft each to John Hancock International and Sanwa Bank and 20,000 sq ft to Canon Singapore. ''Despite the activity, vacant office space in Singapore's CBD is now in excess of 3.3 million sq ft or 11 per cent of total stock,'' said Mr Roger Cook, Colliers Jardine's chief executive officer. ''We predict vacancies will rise to 12 per cent during 1993 when another 2.5 million sq ft of office space is due for completion. Gross rents at Raffles Place ranged from $23 to $35 per square foot per month, while in the Tanjong Pagar district they were between $16.5 and $26, and in the Orchard Road area, between $19 and $28. These levels were expected to further soften in proportion to the increasing vacancy rate. In the first seven months of last year, department and supermarket sales in Singapore rose by 4.2 per cent, while retail occupancy stood at 94 per cent. Two planned retail developments are: A $1.03 billion complex on a 136,000 sq ft site next to Tampines MRT Station by joint-venture patrons, DBS Land and the Malaysian Pernas Group; A 50,000 sq ft retail parcel in the Urban Redevelopment Authority's Riverside Project has been awarded to Far East Organisation at the bid price of $176 million. ''At the close of 1992, prime retail rents were $71-212 per sq ft per month, including outgoings,'' Mr Cook said. ''Capital values of prime CBD retail space were $2,000 to $10,800 per sq ft. ''Retail rents and capital values will dip a little further in the next 12 months.'' Singapore's industrial property is still strong, with factories 96 per cent occupied and warehouses almost as full. Rentals for prime ground floor warehousing space are $9.40 to $12 per sq ft per month, including outgoings, while upper floors bring $7-$8.50 per sq ft. Singapore's residential property was showing mixed signs, according to Mr Cook. ''Condominium prices have jumped by 19.7 per cent in a 12-month period, ending September 92, although substantial new supply over the next two years should see prices fall by three or four per cent,'' he said. ''Capital values for prime two-bedroom apartments range from $2,220 to $2,772 per sq ft while three-bedroom units fetch $2,200 to $2,728 per sq ft.'' Issued on behalf of Colliers Jardine by Lau Roots.