New Delhi, October 23: After a long slump that started in 2013, the real estate sector may be headed for a revival. While consumer sentiments are still depressed, signs of recovery seem visible if one looks close enough. According to a research by JLL India, a global real estate services firm, there has been a continuous uptick in the residential market since 2017 and by this year, some of the top-tier cities have already surpassed the pre-demonetisation sales levels.