The mathematical models to be used in our DDS are: Findaly model [3]: To estimate the assets to
include in the investment portfolio, this model was selected due to the fact that assumes that the assets included are indivisible, which is the case in real life. Findlay [3] has proposed a portfolio model for the real estate that works fine for portfolio sizes limited to ten assets, because most unsystematic risk reduction occurs over the first ten assets.
The objective is to minimize the overall portfolio risk.