Properties are broken down into three classifications. Each property classification reflects a different risk and return because properties are graded according to a combination of geographical and physical characteristics. These letter grades are assigned to properties after considering factors such as age of the property, location of the property, tenant income levels, growth prospects, appreciation, amenities, and rental income. There is no precise formula that dictates which properties are placed into which class. Grade A space is the most expensive and presents the least amount of risk. Conversely, Grade C is the least expensive but has the most amount of risk. In most instances, it would be cost prohibitive to try and invest enough money into your property for the purpose of moving it up a grade.