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Tooele County, Utah, transforms property assessments with Parcel Value Analysis

By Mindy Longoni and Nick Popovich

ArcGIS Solutions helps you make the most of your GIS by providing purpose-driven, industry-specific configurations of ArcGIS.

 

Property appraisers have a lot on their plate, from ensuring fair property valuations to managing the complexities of ever-changing market conditions. And that plate gets even fuller when appraisers must rely on manual processes with limited GIS support.

The Parcel Value Analysis solution helps appraisers face these challenges by transforming how they visualize and assess property data. How?  With the solution, appraisers can dynamically view standard sales ratio statistics for any group of sales and then stratify the sales based on any property characteristic. Additionally, the solution includes advanced location tools that provide crucial insights, empowering appraisers with a more thorough understanding of sale properties.

In short, by replacing spreadsheets and static systems with interactive maps and apps, appraisers can easily spot outliers and inequities, analyze sales ratios, and uncover neighborhood trends in real time. Here’s how one county made it work for them.

Part and parcel

Tooele County, Utah, lies just 35 miles southwest of Salt Lake City. It is the fastest-growing county in the state, with a growth that continually surpasses the national average. The county’s land parcels—approximately 34 thousand of them—include a mix of rural areas, salt flats, and rapidly developing regions. The job of valuing these parcels belongs to Real Property Administrator (Chief Deputy) Cassandra Macklin and her team of five additional appraisers. Each appraiser is fully responsible for their area—permits, data input, greenbelt, sales cleaning, analysis, and appeals—which means the parcel-to-employee workload is significant.

For years, the county used Excel and NCSS statistical software to manually analyze sales ratios. At the same time, there was just one GIS professional on staff, and that person already had their hands full with tasks for the recorder’s office and emergency management. A sales ratio analyst would pull data, but the bulk of the work fell to the county’s appraisers, who had to meet regularly to review and adjust those ratios and then meet again to review the changes. The process improved after the county adopted PUMA, a state-sponsored computer-assisted mass appraisal (CAMA) system; moving sales into this program allowed for the live connection to data. .  However, the NCSS output, analysis process, and the review remained time-consuming and cumbersome.

But then, at the 2022 GIS & Valuation Technologies Conference in New Orleans, Macklin attended a presentation about the Parcel Value Analysis solution. She was impressed by the solution’s ability to update ratios visually and in real time based on filters. It was clear to her that adopting the solution would provide a significant improvement over the county’s current methods.

Three people stand at an airport boarding gate. On the left, a man with a beard in a dark gray hoodie smiles toward the camera. In the middle, a smiling woman with long dark hair holds a laptop faced toward the camera; the computer monitor shows a map. On the right, a man with glasses and a red polo shirt smiles towards the camera. He is wearing a backpack and has a cell phone in his front shirt pocket.
Adam Mausser, Cassandra Macklin, and Dylan Haight wait to fly home after attending the 2024 Charlotte, North Carolina, GIS & Valuation Technologies Conference. “When you’re excited about a solution, you work on it all during the conference and even at the airport,” says Macklin.

Game changer

Tooele County implemented the solution, and now, appraisers all have access to live data and can perform their own analyses and make real-time adjustments. The appraisal process is more efficient and less stressful, and not having to wait for the sales ratio analyst to review and approve changes means that the team easily meets state deadlines. In fact, implementing the Parcel Value Analysis solution has shaved about three weeks off the timeline.

The Parcel Value Analysis solution app is open to the Sales Analysis page. An embedded map shows several multicolored point features representing parcels. It is surrounded by a filter panel, assessment level statistics, and a table with parcel information (identifying features blurred out).
When county appraisers use filters on the Sales Analysis page, key statistics and the map display dynamically update.

Clean plate

If increased efficiency and decreased appraisal times aren’t impressive enough, Parcel Value Analysis has also helped the county improve visualization and better analyze vertical equity. Appraisers can use the solution to see the impact of clustering or ratio discrepancy on property values in a specific area, for example, something that was difficult to visualize in a spreadsheet. And, by adding filters to a map, appraisers can see ratios between different price ranges, which makes it easier to ensure consistency and address any issues related to vertical equity.

Assessment level statistics show on the left. At the top right, a scatter plot shows the relationship between sale and assessment values. At the bottom right, a vertical bar chart shows the ratio distribution.
By grouping high sales and low sales, Tooele County appraisers are able to visualize that they have properties consistently valued. Here, sales falling between $400–$600k show suitable vertical equity.

From the inside out

The solution has had internal benefits as well. Because appraisers have access to the same live data, perform their own analyses, and make adjustments in real time, meetings are now less frequent but more productive. Tonya Short, appraiser and lead sales analyst, loves how quickly she can identify issues in values, while appraiser Adam Mausser says that the solution helps them adjust their appraised values and align their ratios much more quickly. And according to assessor Joy Peters, the solution has brought positive change to the office, and she firmly believes that appraisal analysis needs to go in this direction.

Cassandra Macklin is thrilled with the profound success of the solution and credits her team for their willingness to embrace new technology and Nick Kenczka of the Utah State Tax Commission for his collaboration and program insights. She’s especially grateful to the county’s GIS analyst Dylan Haight, who took the time to learn the solution and figure out how to tie it into their live data.

Like her team, Macklin appreciates the solution for improving efficiency and saving time, saying, “I am so thankful I was not up until midnight making adjustments like I have done in previous years.” Thanks to the Parcel Value Analysis solution, Macklin and her team can rest easy, knowing that midnight changes are a thing of the past.

Learn more

For more information about the Parcel Value Analysis solution, check out the following resources:

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