Foreign direct investment in India's real estate sector increased 80 times between 2005 and 2010 after India fully opened to foreign investment in real estate in 2005. The document outlines the guidelines for foreign direct investment in real estate projects in India, including the minimum investment amounts, timelines for completion, and sectors that are permitted for full foreign ownership like townships, housing, and built-up infrastructure. It also discusses rules for investment by non-resident Indians and foreign nationals.