Several assessment tools have appeared, for example, in the Central European Market, which aim to control as well as make public the sustainable quality of real estate. Properties meeting the requirements of such assessment tools are certified with a label. The certificate can then be applied in the marketing strategy of the real estate. However many potential clients such as investors, companies, and real estate managers remain unconvinced that investing in a certificate increases the value of their property. They are, for example, not sure at which phase of the life-cycle (planning, construction and usage), and which type of property would benefit (income, image and reduction of occupancy costs) from the certificates. Do certified properties meeting quality standards as defined by LEED, BREEAM and DGNB vary from each other and from conventional buildings, or does a certification simply bring extra costs to companies, meaning in the end just a new name for the same old quality? Comparing the benefit of International Assessment Methods