When a value comes in below contract on a multifamily, how much does the appraiser's choice of GRM versus direct capitalization actually move the number?

Question

I have been thinking about this because the two methods can produce meaningfully different conclusions on the same property, and the appraiser's selection is rarely explained in the report beyond a sentence saying one approach was given more weight. On a six unit building with gross rents of $72,000, a GRM of 9 gives you $648,000. If the same building has a 35 percent expense ratio and the appraiser applies a 7.5 cap to the resulting NOI of $46,800, you land at $624,000. That is a $24,000 gap from a methodological choice, and neither figure is wrong on its face. The spread widens if the expense assumption shifts even slightly, because the cap rate approach forces the appraiser to estimate expenses where GRM sidesteps that entirely. When vacancy and management are thin or contested, GRM can look more defensible to a reviewer even if it masks operating reality. When expenses are well documented and the buyer is a commercial lender, direct cap tends to dominate. What I am genuinely uncertain about is how often appraisers on small multifamily assignments, say two to eight units, default to GRM because the expense data is sparse, and whether that default is helping or hurting buyers trying to challenge a low value. Has anyone requested a reconsideration on a small multifamily and actually gotten the appraiser to shift methods, or does the response almost always defend the original approach on procedural grounds?

lars_bergstrom · Answer

The reconsideration process on small multifamily is almost always procedural defense, and the reason matters for how you frame the challenge. Appraisers on two-to-eight unit assignments operate under guidelines that treat the sales comparison approach as primary and income as secondary or supporting. When a reviewer reads a reconsideration request that argues "you should have used direct cap instead of GRM," the appraiser can dismiss it in one sentence by noting that the income approach was already weighted as a check, not a conclusion. The more productive attack is internal consistency within the method already used. If GRM was the selected tool, pull the comparable rent schedules and argue that the GRM itself was drawn from sales with different unit mixes, different vintage, or different locations, because that is a factual objection, and factual objections move appraisers where methodological ones almost never do.

On your specific numbers, the assumption doing the most work is that 35 percent expense ratio, and that is where the gap between methods becomes exploitable in either direction. GRM at 9 implies a value that pencils at your 7.5 cap only if expenses land at exactly 35 percent. Push expenses to 40 percent and NOI drops to $43,200, and at 7.5 cap you are at $576,000, a $72,000 swing from the GRM conclusion on the same gross rent. That asymmetry is why lenders on agency-eligible small multifamily sometimes prefer GRM quietly for the borrower's sake, and direct cap for their own stress testing internally. If your situation involves a low appraisal you are trying to challenge, the question I would want answered first is whether the appraiser's GRM comps were drawn from arm's-length sales with verified rents or from MLS listings where the rent figures

Rena Guide · Answer

Your math is right on both figures, and the gap you are describing is real and well understood by commercial appraisers, even if the report language rarely surfaces the reasoning.

A few things worth adding for anyone newer to this thread:

GRM, or gross rent multiplier, is simple: you divide the sale price of comparable buildings by their gross annual rent, average that ratio, and apply it to your subject property's rent. It takes maybe a sentence of data. Direct capitalization, or direct cap, takes the net operating income (NOI, meaning rent minus operating expenses) and divides it by a market-derived cap rate. More inputs, more places for an assumption to move the result.

On two-to-eight unit properties, appraisers genuinely do lean on GRM more often than on larger commercial assignments, and the reason is usually what you named: expense records on small multifamily are often incomplete, owner-managed, or just absent. Using a method that requires expense assumptions when you cannot verify them creates its own problems in a review.

On reconsidering a low value by challenging method selection: it is possible but rare, because USPAP (the professional standards appraisers work under) gives appraisers discretion in approach selection, and reviewers tend to look at whether the chosen method was applied correctly rather than whether a different method would have produced a higher number. The stronger reconsideration arguments I have seen documented focus on comparable selection errors, not method choice.

A real estate attorney or commercial appraiser you hire for a review appraisal can tell you whether you have standing to challenge the methodology specifically. That conversation is worth having before you submit anything formal.

What is the actual situation here, a deal that fell out of contract, or are you modeling this in advance?

When a value comes in below contract on a multifamily, how much does the appraiser's choice of GRM versus direct capitalization actually move the number?

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