Valuing small multifamily when the comps do not exist

Properties of two to four units occupy a peculiar position. They are financed as residential property, appraised largely on sales comparables, and operated as income property.

That mismatch creates both confusion and, occasionally, opportunity.

The two methods

Sales comparison values the property against recent sales of similar properties, adjusting for differences in size, condition, location and features.

This is the primary method for one to four unit residential property, including for lending purposes.

Income capitalization values the property as NOI divided by a market cap rate.

This is the primary method for five units and above, and for commercial property generally.

The result is a structural break at five units. A four-unit building is valued largely on what similar buildings sold for. A five-unit building is valued on what it earns.

Why the break matters

Improving the income of a four-unit property does not necessarily increase its appraised value, because the appraisal looks at comparable sales rather than at your rent roll.

Improving the income of a five-unit property increases its value directly and proportionally, at the prevailing cap rate.

An extra $10,000 of NOI at a seven percent cap rate is roughly $143,000 of value. On a four-unit property, that same improvement might barely register in the appraisal.

This is the main argument for stepping up to five units and above, and it is a real one. It is also why value-add strategies work better on commercial-classified property.

The financing counterweight

Four units and below qualify for residential financing — better rates, longer fixed terms, lower down payments, and owner-occupied programs if you live in one unit.

Five and above require commercial financing, with shorter terms, balloons and higher coverage requirements.

So the trade is: better financing below five units, better value creation above.

Most investors who scale eventually cross that line deliberately.

Valuing two to four units in practice

The comparable sales method requires comparables, and in many markets small multifamily transacts infrequently.

When true comparables do not exist, appraisers stretch — using older sales, more distant locations, or dissimilar properties, all with adjustments. The result carries more uncertainty than the confident number on the report suggests.

Which means appraisals on these properties vary more than on single-family homes, and a low appraisal is a genuine transaction risk.

The practical response is to do your own comparable analysis before making an offer, using every small multifamily sale you can find in the area over the past year, and to know what the number is likely to be.

The gross rent multiplier

A rough screening tool used on small multifamily: purchase price divided by annual gross rent.

A property at $400,000 grossing $48,000 has a GRM of about 8.3.

Its virtue is speed, and its weakness is that it ignores expenses entirely. Two properties with identical GRMs can have very different net income depending on who pays utilities, what the tax burden is, and the condition of the building.

Use it to sort listings, never to make a decision.

Value the income anyway

Even where the appraisal will not, you should.

Run the income capitalization value alongside the comparable sales value. If the income value is well below the comparable value, you are paying for something other than the cash flow — location, appreciation potential, or optimism.

That can be a legitimate decision. It should be a conscious one.

In many high-cost markets, small multifamily trades well above what its income supports, because owner-occupiers and appreciation-focused buyers set the price. Investors buying purely for cash flow in those markets are competing with people using different math.

The appraisal risk in practice

Because comparables are scarce, appraisals on small multifamily come in below contract price more often than on single-family.

Practical protections: include an appraisal contingency; have your own comparable analysis ready to provide to the appraiser, which is permitted and sometimes useful; know how much additional cash you could bring if the appraisal falls short; and be prepared to renegotiate.

A low appraisal is also information. If a professional using market data cannot support your price, that is worth considering rather than dismissing.

What actually drives value here

For two to four units, in rough order: location, unit mix and size, condition, parking, separate utility metering, and whether units are legally permitted.

The metering point is worth emphasizing. Separately metered units are worth meaningfully more than master-metered ones, because the owner does not carry the utility cost or the risk of a tenant's usage. Converting master-metered buildings, where feasible, is among the better returns on capital available in this segment.

The permitting point is equally important. An unpermitted fourth unit in what is legally a triplex is a serious problem — it affects value, insurance, financing and enforcement risk, and municipalities do act on it.

Verify the legal unit count with the municipality rather than accepting the listing.

General information about real estate valuation, not investment or appraisal advice. Valuation methods and lending classifications vary. Consult qualified professionals about any specific property.