Posted 3 months ago Do You Know The Most Important Number In Real Estate? The value of the property is the most important number in real estate, no matter what part of investing you're involved in. Don't depend on friends, family, sellers or even real estate agents to know the number, though you can use them for help. In order to know your exit price, you need access to MLS listings. Use this information as well your own knowledge and other resources to determine what is a fair price for the property whether you're buying, selling, renting, etc.