BRIEFCASE GUIDES / COMMERCIAL REAL ESTATE
The gross rent multiplier (GRM) is a property's price divided by its gross annual rental income. A $1.2 million fourplex that brings in $100,000 of rent a year has a GRM of 12. It is a fast screening tool for comparing rental properties, not a valuation method you should rely on alone.
GRM is popular with small multifamily and single-family rental investors because it needs only two numbers that are almost always available: the asking price and the rent roll. That speed is useful when you are sorting through dozens of listings. It is also the metric's main weakness, because it ignores every expense.
01
FORMULA
GRM = Property price ÷ Gross annual rent
Gross annual rent is scheduled rent before vacancy and before any expenses. Some investors use monthly rent instead, which produces a much larger number (a GRM of 12 on annual rent is a GRM of 144 on monthly rent). Both are in use, so always check which one a broker or comparable sale is quoting.
You can rearrange the formula to estimate value: Estimated price = GRM x Gross annual rent. If similar duplexes in a neighborhood trade at a GRM of 10 and a duplex rents for $36,000 a year, a quick estimate of its value is $360,000.
02
Hypothetical listings, round numbers, to show the math only:
Listing A: price
$540,000
Listing A: gross annual rent
$54,000
Listing A: GRM
10.0
Listing B: price
$600,000
Listing B: gross annual rent
$50,000
Listing B: GRM
12.0
At first glance Listing A is cheaper per dollar of rent. But suppose Listing A has tenant-paid utilities missing, an older roof, and a property tax bill that is about to reset, while Listing B is newer with tenants paying their own utilities. Once you subtract expenses and calculate NOI, Listing B could easily produce the better cap rate. That is the core lesson of GRM: use it to choose which properties deserve a full underwriting, then do the full underwriting.
03
A lower GRM means you pay less for each dollar of rent, which usually suggests a faster payback before expenses. But there is no universal good GRM. Multipliers are higher in expensive coastal markets where rents are low relative to prices and lower in many Midwest and Southern markets where the reverse is true. Newer buildings with lower expected repair costs usually trade at higher GRMs than older ones.
The only meaningful benchmark is recent sales of similar properties in the same submarket. Pull three to five comparable sales, divide each sale price by its rent at the time of sale, and see where the subject property falls in that range.
04
01
GRM uses gross rent; the cap rate uses net operating income (rent minus vacancy and operating expenses).
02
GRM is a multiple (price ÷ income); the cap rate is a yield (income ÷ price), so a lower GRM roughly corresponds to a higher cap rate.
03
GRM is quicker and needs less data; the cap rate is more accurate because expenses can vary enormously between buildings.
04
Commercial investors and lenders rarely rely on GRM; they use cap rates, DSCR, and debt yield.
05
01
It ignores operating expenses, which can consume a large share of rent and differ sharply between properties.
02
It ignores vacancy and collections.
03
It ignores financing, so it says nothing about your cash flow; use cash on cash return for that.
04
Rent figures in listings may be pro forma or include units at above-market rates.
05
It does not capture condition, capital needs, or location quality.
Use GRM as a first filter and a sanity check against comparable sales, then move to NOI, cap rate, and a real loan quote before making an offer.
TAKEAWAYS
01
GRM = price ÷ gross annual rent.
02
Lower GRM means a cheaper price per dollar of rent, before expenses.
03
Benchmark against recent comparable sales, not national rules of thumb.
04
It ignores expenses, vacancy, and financing, so it is a screen, not a valuation.
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