RECORD take-ups in a booming economy will ensure continued strength for Hong Kong's office market, a report from a leading property consultancy has said. The report, prepared by Colliers Jardine's research department on the territory's office market, predicted new investment should keep supply tight. Strong demand would fuel further rent rises until 1995 for Grade A accommodation. The research indicated that, between 1993 and 1997, about 17 million square feet of Grade A supply would come on stream. Although the forecast for the following year was conservative, infrastructure plans after that would have a ''positive impact'' on supply. The report said the Government's proposed Metroplan and the Central-Wan Chai and Kowloon reclamations would provide about 100 million sq ft of commercial space. There was record take-up of new office space - 5.3 million square feet - in 1992. The figure was double 1991 levels and almost three million sq ft was Grade A accommodation, accounting for eight per cent of total office stock. Colliers said the surge had continued into 1993 due to established firms expanding, companies taking advantage of more attractive rental levels on lease expiry and the growth of the financial sector in Central. Firms were also planning ahead by committing to new space in anticipation of future rising rentals. That should take the figure to a new high this year. According to the research report, vacancy rates across the territory have fallen significantly in the past 12 months. Colliers predict they will continue to do so for at least the next three years. In 1995, Grade A office vacancy rates will be as low as 2.2 per cent in Central, 5.3 per cent in Wan Chai, 5.2 per cent in Causeway Bay and 2.7 per cent in Tsim Sha Tsui. In Central, Grade A office rents jumped nine per cent in the first six months of this year. Although rents in Causeway Bay and Wan Chai bottomed out in 1992, stronger demand is already being shown because of the shortage of space in Central. In Tsim Sha Tsui, low vacancy rates have pushed charges up to $38 per sq ft - just under Causeway Bay and Wan Chai figures. Average Central rents are more than $50. Space in Exchange Square is pushing $70. Because of the rental growth, capital values have also risen. Colliers reported a transaction price of $12,000 per sq ft in the Far East Finance Centre in Admiralty.