Gross Rent Multiplier
Gross Rent Multiplier (GRM) is the ratio of the price of a real estate investment to its annual rental income before accounting for expenses such as property taxes, insurance, and utilities; GRM is the number of years the property would take to pay for itself in gross received rent. For a prospective real estate investor, a lower GRM represents a better opportunity. 
The GRM is useful for comparing and selecting investment properties where depreciation effects, periodic costs (such as property taxes and insurance) and costs to the investor incurred by a potential renter (such as utilities and repairs) can be expected to be uniform across the properties (either as uniform values or uniform fractions of the gross rental income) or insignificant in comparison to gross rental income. As these costs are also often more difficult to predict than market rental return, the GRM serves as an alternative to a measure of net investment return where such a measure would be difficult to determine.
Example; $200,000 Sale Price / $20,000 gross annual rental income = 10
Today, it is quite common for GRM to be quoted by real estate professionals using annual rents rather than monthly rents. A 100 GRM (monthly rents) = 8.33 GRM (annual rents). An 8.33 GRM calculated on annual rents suggests the gross rent will pay for the property in 8.33 years.
The common measure of rental real estate value based on net return rather than gross rental income is the Capitalization Rate or Cap Rate. In contrast to the GRM, the Cap Rate is not a multiplier but a rate of annual return. A similar multiplier to the GRM derived from net return would be the multiplicative inverse of the Cap Rate.
- "Understanding the Gross Rent Multiplier in Commercial Real Estate". www.propertymetrics.com. Retrieved 2016-09-13.
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