Understanding Gross Rent Multiplier (GRM)
The Gross Rent Multiplier (GRM) is a simplified valuation metric used in residential and commercial real estate to compare investment opportunities. Unlike Cap Rate, which requires detailed knowledge of operating expenses and NOI, GRM relies solely on gross revenue.
GRM is defined as the ratio of the property's purchase price (or market value) to its gross scheduled annual rent:
$$\text{GRM} = \frac{\text{Purchase Price}}{\text{Gross Scheduled Annual Rent}}$$
$$\text{Implied Value} = \text{Gross Scheduled Annual Rent} \times \text{Market GRM}$$
For example, if a duplex is purchased for \(\$400,000\) and generates \(\$40,000\) in gross annual rent, its GRM is \(\$400,000 / \$40,000 = 10\). This means it takes 10 years of gross rent to equal the purchase price. A lower GRM indicates a more attractive investment because you pay less per dollar of gross income.