* August property investment +9.2 pct y/y vs +13.2 pct in July - Reuters calculation. : * Developers’ funding conditions improve (Adds details on land purchases, sales growth milestone, analyst quotes) BEIJING, Sept 14 (Reuters) - China’s real estate investment moderated in August on slower construction and home sales, as authorities’ tight controls on the sector continued to take out speculative heat. Real estate has been one of the few bright spots on China’s investment front, partly due to robust sales in smaller cities where government efforts to tame hot property prices were less stringent.