The secret of evaluating commercial property lies within a model where one property can independently be evaluated against another property.The basis of any model is to ensure that proper calculations are made with regards to the sustainability of any property for sale in the market. This entails doing the calculations. If the calculations do not work then you should not make the investment.Our model has the following attributes:A Summary The summary makes provision for the size of the property to be purchased expressed in gross lettable area (GLA). It also makes provision for the rent that can be obtained for the commercial property to rent. This is crucial since this will provide an indication whether you can compete with other similar properties in the same area. It makes provision for the nett rental income that is obtained from the property since this determines the value of the property.Variables The variables include the average interest rate over the past 20 years. It should also include the average inflation rate over the past 10 years which should be factored into the calculations. Annual rental increases should be factored in which will result in the yield to be obtained over into the future for at least a 10 year period. Provision for a vacancy rate is crucial when compiling your model. All expenses are captured in this section,The AssessmentThe assessment is the culmination of all the previous part into one view of the model. This will include the NAV (Nett Asset Value) determined on an annual basis. This will also include the gross rental income associated with the property with all escalations included. All expenses are reflected here inclusive of the monthly loan payments based on the average interest rate over the past 20 years. Calculating the gross rental income less all relevant expenses will result in the pre-tax cash flow on a monthly basis. From here all tax obligations can be calculated resulting in an after tax cash flow calculation. Determining your ROI (Return on Investment) is a direct result of these calculations. The IRR (Internal Rate of Return) is derived from these calculations making it a crucial tool to compare different properties.Combining all the attributes of a model dedicated to evaluate commercial property for sale will ensure that you make the correct decision time and again. Most commercial property for sale are offered as commercial property to rent. It is therefore crucial to ensure that the correct investment decision is made based on pure calculations.