Gross Rent Multiplier (GRM), defined

Gross Rent Multiplier (GRM) is a real estate valuation ratio equal to a property's price divided by its gross annual rental income. It answers one question fast: how many years of gross rent would it take to equal the purchase price? A GRM of 10 means the building costs ten times what it collects in rent each year.

Investors use GRM as a first-glance screen — a way to line up several rental buildings and quickly spot which ones are priced high or low relative to the rent they produce, before doing the deeper work.

The GRM formula

The math is deliberately simple:

  • GRM = Property Price ÷ Gross Annual Rental Income

"Gross" is the key word. GRM uses total rent collected — it does not subtract taxes, insurance, maintenance, water, or any operating costs. That's what makes it quick, and also what makes it incomplete.

A worked example

Say a Brooklyn multifamily building is listed at $2,000,000 and collects $200,000 in gross rent per year:

  • $2,000,000 ÷ $200,000 = GRM of 10

If a comparable building down the block is priced at $2,400,000 with the same $200,000 in rent, its GRM is 12 — meaning you'd pay more per dollar of rent for essentially the same income. All else equal, the lower GRM is the better value on this one metric.

Why GRM only tells part of the story

Because GRM ignores expenses, two buildings with an identical multiplier can perform very differently once you account for property taxes, heat and hot water, repairs, and vacancy. That's why serious buyers move quickly from GRM to more complete measures like Net Operating Income and Cap Rate, which factor in what it actually costs to run the property.

Think of GRM as the screen you use to decide which deals are worth a full underwrite — not the number you close on.

Using GRM in the NYC and Brooklyn market

New York adds wrinkles that a single ratio can't capture:

  • Rent-stabilized units. In a rent-stabilized building, legal regulated rents may sit below market, which pushes GRM higher and can mask both upside and risk. The rent roll and DHCR history matter more than the multiplier.
  • High operating costs. NYC property taxes, water and sewer charges, and compliance obligations (HPD registration, inspections, heat rules) take a real bite that gross rent hides.
  • Neighborhood pricing. GRMs in strong Brooklyn submarkets like Bed-Stuy or Crown Heights naturally run higher than in cheaper markets, so only compare buildings within the same area.

For NYC owners and buyers, GRM is best used to shortlist — then paired with a proper expense analysis and a look at the building's compliance status.

Get a grounded valuation

A multiplier is a starting point; a real number comes from local knowledge of rents, expenses, and regulation. If you own or are eyeing a Brooklyn rental, start with a property consultation — we'll show you realistic market rent and how the building actually performs. Have questions on a specific deal? Get in touch and talk to a principal directly.