Assessor Paul D. Petersen

Maricopa County Assessor's Office

News for 2013

Maricopa County, Arizona Selects Esri Canada's Assessment Analyst Solution to Improve Property Assessment

Geographic-Assisted Mass Appraisal solution will provide more precise valuations for 50,000 parcels in Arizona

TORONTO - October 21, 2013 - Esri Canada today announced that Maricopa County in Arizona will be implementing the company's Assessment Analyst solution. The geographic information system (GIS) desktop software fully integrates with Computer-Assisted Mass Appraisal (CAMA) systems, resulting in a powerful Geographic-Assisted Mass Appraisal (GAMA) solution that provides tools for data collection, audits, maintenance, updates and spatial analysis. It allows assessors to significantly improve the quality of data for accurate assessments. It also automates assessment workflows, saving time by allowing assessors to make calculations, run valuation models and reassess properties on the fly. The County will use the solution to analyze and revaluate a pilot area of 50,000 parcels covering North Phoenix and East Glendale in Arizona.

We looked for a fully integrated tool set that includes traditional imagery, oblique air photography, bulk collected street front photography and geo-referenced building sketches all seamlessly working together to ensure that data sent to property owners is the most accurate, says Tim Boncoskey, chief deputy assessor, Maricopa County. This solution provides us with a tested methodology for property revaluation that has worked in large assessment jurisdictions in North America.

Based on Esri's ArcGIS platform, Assessment Analyst is a configurable solution that allows assessors to view and modify valuations produced by their CAMA system and detect errors in source data by examining the CAMA data simultaneously with remotely sensed information. It allows assessors to efficiently manage projects through an intuitive dashboard and monitor productivity. The solution is made available as a group of themed applications that support data acquisition, valuation, market analysis, audit and administration.

Maricopa County will combine previously purchased Pictometry imagery with analytics in Assessment Analyst to conduct a more comprehensive review of their 2015 assessment roll. The solution will help grow the County's assessment tax base by detecting missing property improvements and the resulting property tax for the jurisdictions in the pilot area. It will also allow the County to correct valuations for 2016 much sooner with fewer onsite inspections and improve the accuracy of data for use in valuation models.

For more information on Assessment Analyst, visit:


About Maricopa County

Maricopa County is the fifth largest of Arizona's 15 counties, and the 14th largest county in the United States. Maricopa County is larger than five states and the District of Columbia. The county measures 132 miles from east to west and 103 miles from north to south. Twenty-four cities and towns are located within Maricopa County's outer boundaries. Maricopa County has a population of over 3,800,000 people (2011), making it one of the most populous counties in the nation. For more information, visit

About Esri Canada

Founded in 1984, Esri Canada provides enterprise geographic information system (GIS) solutions that empower businesses, governments and educational institutions to make timely, informed and mission-critical decisions by leveraging the power of geography. The company distributes the world's leading GIS software from Esri, Schneider Electric, Cityworks Azteca Systems, Inc. and other technology partners. Headquartered in Toronto, the company serves over 10,000 customers from 16 regional offices across Canada. Esri Canada has joined the elite rank of Canada's Best Managed companies and has been named to the Branham300. Information about the company can be found at

For media inquiries, please contact: Esri Canada:

Assessor Peterson meets with Arizona Assessor's at Arizona Tax Conference

Assessor Petersen meets with the other Assessor's from across Arizona in September at the Arizona Tax Conference in Flagstaff.

Assessor Petersen Releases CAMA Project Request For Proposal (RFP)



Maricopa County Assessor Paul Petersen released the largest RFP in Maricopa County history. The proposal comprises 4,046 pages and equates to nearly 36 MB of computer data. This proposal is for the CAMA (Computer Assisted Mass Appraisal) Project, which will be the hallmark of new County Assessor Paul Petersen's administration.

The CAMA Project is the long overdue update to the entire Assessor's office computer system. "The historic size of this RFP is in direct proportion to the historic nature of what the CAMA Project will do for the Assessor's office," said Assessor Paul Petersen. Currently, the County Assessor computer system for the fourth largest jurisdiction in the United States is based on 20+ year old technology. "Imagine going from an original cell phone to a smartphone. That's what this RFP will do for the Assessor's office - it will change how we do business and meet the needs of the property owners of Maricopa County," continued Mr. Petersen.

"I want to congratulate all those at the County who worked on this historic proposal. Without their diligence, and hard work, this would not have been possible," said Joe Guy, CAMA Procurement Officer.

"We have been involved with many jurisdictions in their CAMA selections. This is the biggest and most integrated of all the solutions we have ever been a part of as a consulting firm," said Jeff Tompkins, Senior Partner, with Accent, Inc., Maricopa County's chief CAMA advisor on the project.

The CAMA Project is expected to have proposals submitted by Dec. 2013 and the transition to the new program beginning in late 2017.

Contact: Robert Pizorno
Tel: (602) 372-0570
Cell Phone: 480-329-8219

Maricopa County Assessor's Office Property Review Project

(MARICOPA COUNTY) - The Maricopa County Assessor's Office has contracted Tyler Technologies, Inc. to provide real property appraisal services for the county's 2015 general reassessment.

The Assessor's office with the help of Tyler Technologies, Inc has committed to a property-imaging project to provide detailed, high-resolution street level images for improved data verification will be underway beginning September 3rd, 2013. The crews will photograph properties from inside white vans that will be clearly marked with signs indicating they are conducting a mapping and appraisal project for the county.

The imaging crews are expected to be in the area from September 4th - October 15th. During that time they will be in constant communication with the Assessor's Office. Information concerning their routes will be provided to City and Police agencies.

The digital photographs will improve the quality of visual data used by county appraisers. In addition, the project will allow verification and correction of addressing discrepancies.

View the ESRI Pilot Area (PDF). For further information, please contact the County Assessor's Office at 602-506-3406.

Paul Petersen named new Maricopa County Assessor

Paul Petersen named new Maricopa County Assessor

Assessor Russell Is Appointed to Justice of the Peace, East Mesa District Courts

Watch the video.

Supervisors Appoint New Justice of the Peace

MARICOPA COUNTY - The Maricopa County Board of Supervisors has voted to appoint current Maricopa County Assessor Keith Russell to fill the vacancy in the East Mesa Justice Court District.

"Keith Russell is an outstanding public servant. Having been elected by the residents of Maricopa County to serve as our Assessor for three terms, he has earned the trust of the voters and is well versed in community issues. I believe he will serve as Justice of the Peace with distinction," said Supervisor Steve Chucri.

Chucri continued, "This was not an easy decision to make. I personally interviewed every one of the 17 eligible applicants and there were a number of well qualified people, who I hope we will see in leadership positions in the future."

Russell's background will fit well with the needs of the Justice Court. He is a third generation native of the East Valley and attended public school in Mesa before graduating from Arizona State University.

Justice of the Peace Russell will do for the Justice Courts that which Assessor Russell has been doing for nearly a decade: make fair and impartial decisions.

Justice of the Peace Russell said, "I am honored that the Board of Supervisors has selected me to serve as the Justice of the Peace in East Mesa. I believe that my team and I have improved the operations of the Maricopa County Assessor's Office and I will bring that same professionalism, consistency, and temperament to the court. I appreciate the hard work of all of the Assessor's Office family and will miss them as I take on the challenges of serving as a Justice of the Peace."

Chief Deputy Assessor Tim Boncoskey will serve as acting Maricopa County Assessor until such time as the Board of Supervisors appoints a replacement.

Assessor 2014 Notice of Valuation - Outreach Presentation

View the 2014 Notice of Valuation Outreach presentation (PPT).

2014 Notice of Valuation Press Release

Phoenix --- On February 22, 2013, the Maricopa County Assessor's Office will send out nearly 1.5 million valuation notices for tax year 2014 to all property owners in Maricopa County. This year, for the first time in the last six years, single-family residential properties will show an increase in their median value.

The single-family residential median value in Maricopa County is showing marked improvement from prior years, said Maricopa County Assessor Keith Russell. Not all property types are seeing such a strong recovery, but we are beginning to see improvement in most property types in Maricopa County added Russell.

Single family residences and condominiums are seeing a median increase of approximately 16 percent. The median value for tax year 2013 was $102,100 and for tax year 2014 it is $118,500. This is still far below the median value for tax year 2008 which was $220,500. The median value for residential properties changed from $109,600 in tax year 2013 to $127,000 in tax year 2014; this is a 15.88 percent increase in the median value. The median value for residential condominium properties changed from $62,000 in tax year 2013 to $70,500 in tax year 2014; this is a 13.71 percent increase in the median value.

The type of property that showed the most improvement was apartments. The median apartment value increased from $70,100 in tax year 2013 to $101,000 in tax year 2014. It should be noted that eighty-seven percent (87%) of the apartment units in Maricopa County consist of properties that have twelve (12) or fewer units. Continued decline in foreclosure activity among apartments, in addition to generally improving market conditions, are the primary reasons for the significant increase in the median full cash value for apartments.

The only two classes of property that showed declines in their median values from the previous year were commercial properties and vacant land. The median commercial value went from $359,000 in tax year 2013 to $350,500 in tax year 2014 --- a 2.37 percent drop in the median full cash value. Vacant land went from a $15,884 median value in tax year 2013 to a $15,800 median value in 2014 --- a 0.53 percent drop.

It is the duty of the Maricopa County Assessor to locate, indentify, and value all types of property in Maricopa County. The annual notices being received by all property owners is titled 2014 but is reflecting market conditions as of January 1, 2013.

Assessor Russell reminds all property owners to closely review all the information on their valuation notice. If they disagree with any of the information contained on the notice, then they should consider appealing the notice. This year, the administrative appeal deadline is April 23, 2013 (by statute this is sixty (60) days from the mail date).

View all 2014 notice of valuation reports.

View the 2014 Notice of Valuation Press Release (PDF).

2013 Ways and Means Presentation

View the 2013 Ways and Means presentation (PDF).