The mission of the Office of the Assessor is to discover, list and value at current market conditions all real and tangible personal property in the City of Detroit for the purposes of levying the tax lawfully imposed and to warrant said levy to the Treasurer of the City of Detroit for collection. The Office of the Assessor is composed of the following divisions:

• Administration
• GIS / Land Records Maintenance
• Operations and Administrative Services
• Valuations & Field Operations

Mayor Sheffield's Executive Order

In January 2026, Mayor Mary Sheffield issued an Executive Order directing the Assessor to make sweeping changes that align with the International Association of Assessing Officers (IAAO) national standards in assessments.  Assessments have long been questioned by Detroiters, and this is a significant effort to demonstrate that this administration is taking steps to make improvements while gaining trust, said Mayor Sheffield.

The Mayor’s EO directs the Assessor to adopt IAAO ratio standards, produce a biannual mass appraisal report and prioritize modifying the city’s existing residential Economic Condition Factors (ECFs).

• Ratio Standards are statistical gauges that will serve as a quality control tool, allowing the Office of the Assessor to verify that property values are closely aligned with actual market activity. Ratio standards act as the primary metric for internal auditing and can identify neighborhood inequities.

• The Mass Appraisal Report explains how the Office of the Assessor arrived at the values for an entire neighborhood. This report provides transparency and accountability in the documented, repeatable methodology that proves the valuation process was fair.

• By Prioritizing Modifying ECFs (Economic Condition Factors), the Assessor’s office ensures that property owners aren't assessed based on general construction costs, but rather the market value of the property in their specific neighborhood. This is a tool to keep assessments localized and fair.

Read the Executive Order

Inquiries

The City of Detroit, Office of the Assessor, is available to serve the public Monday through Friday, with in-person and telephonic services offered Monday through Thursday from 8:00 am to 4:30 pm, and Friday from 8:00 am to 12 noon pm.  Contact our office: 

• By phone at (313)224-3035 or 

• In-person at the Coleman A. Young Municipal Center, Detroit Taxpayer Service Center, 2 Woodward Ave, Suite 130

• By email [email protected], taxpayers can pose questions or schedule an in-person meeting. The Assessor's Office will respond within two business days
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Information on Assessment Appeals

Information regarding Assessor Review, “How to Appeal Your Assessment”, How to submit an appeal” appeal dates, and more can be found at https://detroitmi.gov/node/76521 

Assessment record information is available online here: https://bsaonline.com/Home/WelcomePage?uid=155 

Or inquire at [email protected] 
 

Assessment Suit Settlement Press Release

IAAO Study of Assessment Values in Detroit

2025 Detroit STC Assessment Roll and Practices Audit (PA 660)