The Gross Rent Multiplier or GRM seems to show up in "pro form", sales materials. And it is widely used, therefore people will still state its value. If you are considering a property for investment, the GRM alone is not giving much information, if any at all, in my opinon. That being said, what is a GRM of zero?
Let's say a newly built property is valued at $1,000,000, with no tenants for an entire year.
GRM = property value / annual gross scheduled income
Using our example above:
GRM = 1,000,000 / 0 = 0
Newly built and no tenants for a year. Would this be a great investment, if this were the only information you are given?
Let's look at this in another way. The GRM is a mathematical formula, property value divided annual gross scheduled income.
Division by zero is a mathematical operation that is not allowed, you will get a "division by zero" error on most calculators. You can understand why if you think about how division and multiplication are related.
12 divided by 6 is 2 because
6 times 2 is 12
12 divided by 0 is x would mean that
0 times x = 12
But no value would work for x because 0 times any number is 0. So division by zero doesn't work.
So mathematically, a GRM = 0 does not make sense.
While I was writing this post, Financexaminer give an excellent answer in relation to a MLS.