Highest and Best Use: The Four Tests Every Property Faces

Every appraisal of commercial property rests on one question: what is the best thing this property could be used for? Appraisers call the answer highest and best use. It drives land value, development decisions, and sometimes whether an existing building should stay standing at all.

What is highest and best use?

Highest and best use is the reasonably probable use of a property that is legally permissible, physically possible, financially feasible, and results in the highest value. A use has to pass all four tests in that order. Fail any one of them and it is off the table.

The four tests

1. Legally permissible

Start with what the rules allow. That means zoning, building codes, deed restrictions, CC&Rs, and environmental regulations. If the zone does not allow a car wash, a car wash is not the highest and best use, no matter how well it might perform. A realistic chance of a rezone can count, but it has to be probable and not just hopeful.

2. Physically possible

Next, can the site actually handle the use? Size, shape, slope, soils, access, and utilities all matter. A long narrow lot may not fit a big box footprint. A parcel without sewer may not support a dense project until service is extended. This test removes uses that look good on paper but cannot be built.

3. Financially feasible

Of the uses that remain, which ones produce enough value or income to justify the cost of building them? If a building would be worth less than it costs to build, it fails here. This is where market rents, vacancy, construction costs, and financing come in.

4. Maximally productive

Finally, of the feasible uses, which one produces the highest value for the land? That is the highest and best use. Often two or three uses pass the first three tests. This last step ranks them.

A worked example

Picture a one acre commercial lot. Zoning allows retail, office, and self storage, and the site can physically fit all three. The analysis looks at what each use would be worth when finished, minus what it costs to build including a fair developer profit. What is left over is what that use can afford to pay for the land.

• Retail strip: worth $4.0 million finished, costs $3.3 million. Leaves $700,000 for land.
• Small office building: worth $3.6 million finished, costs $3.4 million. Leaves $200,000 for land.
• Self storage: worth $3.0 million finished, costs $2.4 million. Leaves $600,000 for land.

All three are feasible because each leaves positive value for the land. Retail is the most productive, so retail is the highest and best use, and the land is worth roughly $700,000. These numbers are made up to show the method, but the logic is how appraisers approach it.

As vacant versus as improved

Appraisers run the analysis two ways. “As vacant” asks what the best use would be if the land were empty. “As improved” asks whether the existing building should stay, be renovated, or come down.

When the land as vacant is worth more than the property with its current building, the building is holding the site back. That is the math behind most teardowns and redevelopments. An old single story building on a busy corner can be worth less than the dirt under it.

Why it matters to owners and buyers

For sellers, it explains why two similar sized lots can sell for very different prices. For buyers, it is a check against overpaying for a use the market will not support. For lenders, it is a core part of the appraisal, so it affects how much they will lend.

In my experience, the most common mistake is skipping straight to test four. People fall in love with the most valuable use without confirming it is allowed or that the site can handle it.

How this plays out in Kootenai County

Growth across Coeur d’Alene, Post Falls, Hayden, and Rathdrum has changed the answer on a lot of properties. A parcel that made sense for a single small business years ago may now support something denser, especially along I-90 and US-95.

The legal test is local. Each city has its own zoning code, and the details of a zone like Coeur d’Alene’s C-17 shape what can go on a site. Utility availability can also vary from one side of a road to the other, which can make or break the physical test.

If you own land or an older building and are wondering whether it is being used for what it is really worth, I’m happy to talk through how the four tests apply to your property.