In an enterprise scope, one critical step in the decision making process is the determination of potential investments feasibility and priority. Worldwide the most accepted method for evaluating a project is the Discounted Cash Flow (DCF), where the value of the project is given by the Net Present Value (NPV). However, the DCF does not reflect the value of managerial action, which maximizes results, assuming implicitly that the firm manages its real assets (projects) passively. Therefore, this method is too limited to deal with uncertainties and flexibilities and often leads to wrong decisions. Considered by many respected authors as a new paradigm in investment valuation, the Real Options Theory is viewed as a complement to standard DCF analysis which bridges the gap between strategic intuition and analytical rigor. This work aims not only to introduce some of the many flexibilities that exist in real estate development projects, but also to show how to evaluate projects in a simple and intuitive manner suitable for the investment decisions that developers face day by day. The Real Options approach provides the understanding of the flexibilities and uncertainties inherent to the project development process, assisting in contract making with third parties, as well as providing precious insights about businesses and strategic investments, insights that are more important than ever given the rapid pace of economic change.