Proper Investment Analysing the revenue potential of properties, such as duplexes or flats, is the first step in property valuation. The gross rent multiplier (GRM) and net operating income (NOI), which evaluate a property's profitability, are two common methods used by investors to determine value. A property's appeal is greatly increased by a mix of high rental revenue and well-managed costs, particularly for individuals looking to accumulate wealth over time. Other factors that have an immediate effect on net returns include vacancy rates, property taxes, insurance premiums, and maintenance expenditures.