China's prospering property market will remain attractive to overseas investors in the medium to long term, despite gvoernment’s tightened macro control over foreign investment in Mainland property sector, People’s Daily reported, citing two leading foreign property services companies operating in China.   Jones Lang LaSalle (JLL) said in a statement that real estate in China remains of interest to the medium and long-term investors.   Nicholas Co, director of investment department with international property advisers Debenham Tie Leung (DTZ), said the continued rapid expansion of the Chinese economy compared with the rest of the world had been a major factor behind the growth of overseas investment in the real estate sector, the paper wrote.   Both JLL and DTZ denied that overseas investors in China's property market were purely speculative, a charge that has drawn criticism from the public.   "Based on current models, most of the foreign capital investors take medium to long-term views on the Chinese market with no intention for pure speculation," said the JLL statement.