Demand for office space in major cities across Europe has continued to rise in the last six months, and this trend is expected to continue into 2007, according to the European Office Market Review by the international advisor GVA Worldwide. Improvement in economic conditions across the continent is boosting the demand and take-up of office space, which is leading to a continuing decline in vacancy rates. Rental growth is particularly strong in London, Dublin and Madrid, GVA said.