The document discusses two methods for evaluating real estate investments: the cap rate and gross rental multiplier (GRM). The cap rate represents return as a percentage calculated from net operating income and purchase price, but can be misleading if income is exaggerated. The GRM is calculated from purchase price and rental income, with a lower GRM being better. It recommends ignoring cap rate and determining income using comparables or tax filings, then multiplying income by 7 to determine maximum purchase price.