When There Are No True Comparables: How Unique Properties Are Valued

Most people are familiar with appraisals through home purchases or refinancing. In residential valuation, comparable sales are usually easy to find: recent transactions, close by, and similar in size and style so it is natural to assume all appraisals work this way. But commercial and special-use properties do not.

Churches, daycares, car washes, medical buildings, mixed-use properties, and sites with unusual zoning or physical constraints often have no true comparable sales in the immediate market. In some cases, there may be no direct comps available at all. Relying on weak comparisons is one of the fastest ways to produce a flawed valuation.

Here is how appraisers identify when true comps are limited, why forcing bad comps creates risk, and how credible value can still be determined for such properties.

Why the “Comps Must Be Nearby” Rule Does Not Always Apply

Residential lending often requires recent sales within a narrow radius because similar homes compete in the same neighborhood. Buyers of a three-bedroom home are usually choosing among nearby homes with similar features.

Commercial and special-use buyers think differently; a daycare operator for example looking to buy a building isn’t choosing between two daycares on the same block, they’re evaluating the best-fit property within a 20-mile (or wider) service area. 

In this case, the best comp is not the closest one on a map, but the one that best reflects how a real buyer would evaluate the property.

How to Tell Whether True Comparables Exist for your Unique Property

Before trying to appraise a property using comps, you have to be honest about whether any real ones exist. A few questions worth asking include:

• Is it a special-use property such as a church, school, daycare, car wash, medical office, or mixed-use building? These rarely have direct comps.

• Are there recent sales of similar properties in the area? You're ideally looking at sales within the last one to three years. Anything older and you have to ask whether that data still reflects today's market.

• Is the property unusually large, small, or functionally different from others in the market? A 125,000 square foot warehouse in a market full of 20,000 square foot warehouses doesn't really have peers.

• Do zoning restrictions, easements, wetlands, or other limitations narrow the buyer pool? Physical restrictions like easements, wetlands, and conservation overlays can shrink the buyer pool dramatically.

• Is the buyer pool highly specialized? If only a handful of buyer types would ever consider the property, you're working from a limited dataset by definition.

• Has the market changed so quickly that older sales may no longer be reliable?  Rapidly rising or falling markets can make even recent sales unreliable. In late 2020, using pre-COVID comps to value anything was shaky; investor mindset, demand, and supply had all shifted dramatically in just a few months

• Is the property overbuilt or underbuilt for its market? A luxury build in a modest neighborhood, or the reverse, distorts comparisons. 

• Does it have unusual features such as excess land, specialized build-out, or atypical design? Any of these can push a property outside a normal comp set.

  
  

If several of these apply, the property likely lacks strong true comps, and while that does not make valuation impossible, it simply means a different approach is needed for the right appraisal.

The Risk of Forcing the Wrong Comps

When appraisers cannot find ideal sales, the temptation is to use whatever is available and make heavy adjustments; that can lead to serious errors.

Common problems that come from using this method include:

• Comparing properties that look similar but serve very different buyers

• Relying on sales that are too old or too far away

• Applying excessive adjustments, which weakens the reliability of the comp

• Ignoring highest and best use differences

• Misjudging how the market values special features

Bad comps will always produce bad values, and bad values get deals killed, loans denied, or property taxes challenged.

How Appraisers Value Properties Without True Comps

When direct comparables are limited, experienced appraisers usually rely on several approaches together:

1. Expand the Search: Sometimes the right sales exist outside the immediate area. Appraisers may widen the geography, look at competing markets, consider similar utility even if the use is not identical, or include older sales with careful market adjustments.

2. Use the Income and Cost Approaches:  The income approach estimates value based on market rent, stabilized income, and an appropriate capitalization rate. The cost approach estimates what it would cost to replace the property new, then subtracts depreciation. For special-use properties, the cost approach often carries significant weight.

3. Identify the Likely Buyer: Understanding who would actually buy the property is critical. An investor, developer, or owner-user will all underwrite differently. The likely buyer often tells you more about value than a perfect comp would. Understanding how your most probable buyer thinks can matter more than finding a perfect comp. A religious organization buying a church values the property very differently than a developer eyeing it for redevelopment.

4. Reconcile the Approaches: A credible appraisal does not depend on a single method. It weighs the available evidence, explains why certain approaches are more reliable than others, and clearly documents the assumptions behind the final opinion of value. On a unique property, the explanation is often as important as the number itself.

   
   

The Core Principle

In unique property valuation, similarity in buyer profile and utility matters more than similarity in appearance. Two buildings can look alike but command very different prices if they serve different purposes. Conversely, two very different properties can help inform value if they appeal to the same buyer pool.

What This Means for Owners and Investors

If you own or are considering a property that falls into the no-true-comps category, a few things are worth keeping in mind.

• Expect more analysis and a longer report. These appraisals take more time and cost more to produce, as they should. A thin report on a unique property is a red flag, not a sign of efficiency.

• Value reflects broader market behavior, not just recent local sales. Don't dismiss an appraisal because it didn't work the way a residential appraisal would.

• Help the appraiser help you. Provide income and expense data, renovation history, site plans, lease details, and anything else that helps them understand how the property actually performs. Better input produces better output.

• And ask questions. A good appraiser can explain, in plain language, why they weighted one approach over another. If they can't, that's worth pushing back on.

The bottom line is not every property has a clean set of comparable sales, and that is not a flaw; it simply means the appraisal must be built on broader evidence, stronger judgment, and clearer explanation. A credible valuation does more than state a number; it shows why that number makes sense.