There are many Real Estate Portals in India like www.99acres.com, www.magicbricks.com, www.makaan.com, www.housing.com, commonfloor.com, etc which generate leads of property buyers in India. But its really difficult to convert those property leads into sales as a single lead is shared with multiple real estate brokers. But if you buy leads from expert lead generation companies then those companies will do exclusive campaign for your property and leads are only transferred to you on the basis of exclusive lead agreement. These leads might be slightly costlier that Real Estate Portal Leads but conversion ratio will be excellent.