A commerce system is controlled by collecting information related to property assets from members of the commerce system, storing the information in a database, determining a plurality of sale transaction values for the property asset based upon the information stored in the database, determining a plurality of key investment indicators from the sale transaction values, determining an investment rating based on the key investment indicators, and utilizing the key investment indicators and investment rating to control a decision to conduct a sale transaction for the property asset within the commerce system. The sale transaction values include offer price, fair market rent, taxes, Mello-Roos, insurance, homeowner association fees, property management fees, total expenses, downpayment, loan type, interest rate, and mortgage payment. The key investment indicators include net operating income, capitalization rate, debt service ratio, cash flow, cash-on-cash return, and return on investment.