Comparable Sales

Comparable sales — universally shortened to "comps" in the industry — are recently sold properties that share key characteristics with a subject property, used as the primary basis for estimating fair market value (FMV). Every appraisal, BPO (broker price opinion), and investor valuation in real estate relies on the premise that a property is worth approximately what similar properties have recently sold for in the same area. For mortgage note investors, accurate comp analysis is essential because the property's value determines the collateral backing the debt — and ultimately dictates how much you should pay for the note.

What Makes a Good Comp

Not all recent sales qualify as useful comparables. The strongest comps match the subject property across several dimensions:

Appraisers and BPO agents typically select three to six comps for each valuation, then adjust each comp's sale price to account for differences with the subject. If a comp has a two-car garage and the subject has a one-car garage, the comp's price is adjusted downward. If the subject has a renovated kitchen and the comp does not, the comp's price is adjusted upward. The adjusted prices are then reconciled into a final value estimate.

Adjustments: Where the Art Meets the Science

Raw comp prices are rarely used without modification. The adjustment process accounts for the reality that no two properties are identical:

• Location adjustments. A comp on a busy street may be adjusted upward if the subject is on a quiet cul-de-sac in the same subdivision.
• Condition adjustments. Properties in poor condition are adjusted relative to comps in average or good condition. This is where ARV (after-repaired value) analysis comes in — estimating value after assumed renovations.
• Time adjustments. In rapidly appreciating or declining markets, even a comp from four months ago may need a time adjustment to reflect current conditions.
• Feature adjustments. Additional bathrooms, finished basements, pools, lot size differences, and garage capacity are all common adjustment items.

The quality of the adjustment process is what separates a reliable valuation from a misleading one. Over-adjusting — applying large dollar amounts for minor differences — can artificially inflate or deflate a value. As a note investor, when you review a BPO or appraisal, pay as much attention to the adjustments as to the final number.

Why Comps Matter for Note Investors

Property value is the backstop for every mortgage note investment. Even on a performing loan where the borrower is paying on time, the underlying property value determines your downside protection if the loan defaults. For non-performing loans, comps directly drive your bid price because they determine what the property could sell for in a foreclosure or short sale scenario.

The relationship between the unpaid principal balance (UPB) and the property value — expressed as the LTV (loan-to-value) ratio — is one of the most important metrics in note investing. Strong comps that support a property value well above the UPB mean the borrower has equity, which improves recovery prospects across nearly every resolution strategy.

Common Pitfalls in Comp Analysis

Experienced note investors watch for several issues that can undermine comp reliability:

• Distressed sale contamination. Foreclosure sales and REO dispositions often sell below market value. Using these as comps without proper adjustment understates the subject's value. Conversely, relying only on arm's-length sales may overstate value in a market where distressed sales represent a significant portion of activity.
• Sparse comp data. Rural properties, unique homes, and niche property types (manufactured housing, mixed-use) often lack sufficient recent sales for a reliable analysis. When comps are scarce, investors should widen the search radius, extend the time window, and apply larger risk margins to their pricing.
• Stale comps. In volatile markets, comps from six or twelve months ago may not reflect current conditions. Always check whether the market is appreciating, stable, or declining before relying on older data.
• Appraisal in the collateral file. The original appraisal in the collateral file reflects the property's value at origination, which may have been years ago. Never use the origination appraisal as a substitute for current comps.

For most note investors, pulling comps is one of the first steps in evaluating a potential acquisition. Free and paid tools — including MLS access through a real estate agent, Zillow, Redfin, and county assessor records — make comp research accessible even without a real estate license. The key is to apply consistent criteria, use enough data points, and stay skeptical of any single number.