A GRM built from monthly rents cannot be applied to annual rent because:
Correct Answer
B) The multiplier and the income must share the same basis
Why this is correct: The Gross Rent Multiplier (GRM) is a ratio used to estimate value. The multiplier and the income figure to which it is applied must be expressed on the same time basis (e.g., both monthly or both annual). Applying a monthly GRM to an annual rent would overstate value by roughly 12 times. Why the other choices are wrong: "Annual rents include vacancy while monthly rents do not" is wrong; vacancy is a separate deduction. "Monthly multipliers apply only to residential property" is wrong; the time-basis rule is a mathematical necessity, not a property-type restriction. "Annual figures require a different capitalization rate" is wrong; this confuses GRM with direct capitalization. Exam tip: Always check the time unit (monthly/annual) of both the GRM and the rent figure. Convert one to match the other before applying the multiplier.
Why This Is the Correct Answer
A multiplier is a ratio to a particular rent figure, so the multiplier and the income it is applied to must be derived and used on the same basis.
Why the Other Options Are Wrong
Option A: Annual rents include vacancy while monthly rents do not
Gross rent multipliers are built on gross rent before vacancy in both cases. Vacancy treatment is not what distinguishes them.
Option C: Monthly multipliers apply only to residential property
Monthly multipliers are a convention common in residential work but are not restricted to it.
Option D: Annual figures require a different capitalization rate
Multipliers and capitalization rates are separate tools. A GRM does not involve a capitalization rate at all.
Same Basis In, Same Basis Out
Same Basis In, Same Basis Out. A monthly multiplier on annual rent is twelve times wrong.
How to use: Label the multiplier monthly or annual the moment you derive it. The label prevents the error later.
Exam Tip
Distinguish GRM from GIM. One uses gross rent, the other effective gross income including other income sources.
Common Mistakes to Avoid
- -Mixing monthly and annual bases
- -Confusing gross rent multiplier with gross income multiplier
- -Deriving from one basis and applying to another without conversion
Concept Deep Dive
Analysis
A gross rent multiplier is a ratio of sale price to rent, and its numerical value depends entirely on which rent went into the denominator. Derived from monthly rents, a typical residential multiplier lands somewhere near 100 to 150; derived from annual rents, the same properties produce a multiplier near 8 to 12 — differing by a factor of twelve. Applying a monthly multiplier to an annual rent therefore overstates value roughly twelvefold, which is an error large enough that it usually announces itself, but the underlying principle is what the question is testing: the multiplier and the income must be on the same basis. The same discipline governs the related distinction between a gross rent multiplier, built on gross rent, and a gross income multiplier, built on effective gross income including other income sources. Mixing those produces a smaller but subtler error, and it is the one that survives a sanity check.
Background Knowledge
A gross rent multiplier is sale price divided by gross rent, derived from comparable sales. Monthly and annual multipliers differ by a factor of twelve and must be applied to income on the same basis.
Real-World Application
An appraiser deriving a multiplier of 132 from monthly rents applies it to the subject's monthly rent rather than its annual figure.
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