BRISBANE has the strongest prospects of all Australian capitals in central business district property sales and leasing, according to the latest report from property consultancy Richard Ellis. The agency also said Brisbane was in a better position than other state capitals to take advantage of any economic upturn. According to the report, a healthy confluence of economic factors, including low inflation (at 1.9 per cent in 1993), healthy GDP growth and rising employment levels throughout 1993 have been taken positively by Australian business. Bill Tucker, director of Richard Ellis, Queensland, said the Brisbane marketplace reflected the confidence forecast in the report. Mr Tucker is also responsible for CBD sales and leasing. He said: ''Leasing activity has certainly increased as general business confidence has grown. ''Leasing activity has also been a result of attractive incentive packages. There is evidence that incentives are finally beginning to trend down, and tenants who have not negotiated new leases in recent years are beginning to see 1994 as possibly the last chance to negotiate a long-term lease with terms that reflect the market of the past two years.'' He added that while the current vacancy rate of 13.7 per cent was not healthy, the vacancy rate had been declining since mid-1992 and was forecast to fall sharply in 1995 and 1996. This scenario had led to increased investment in Brisbane CBD. ''Since December 1992, when the MLC Complex was sold for A$55 million (about HK$302.5 million), there have been eight sales of CBD office buildings at prices in excess of $10 million,'' Mr Tucker said.