Individual License
The following information was retrieved from the Department's database at 10/1/2026 3:14:20 PM. The information presented reflects the database records at the time of your inquiry; however, it will not reflect pending updates which are being processed by the Department.
Individual License Details
- License Number
- SA681051000
- Name
- KOISTINEN, DIANA LYNN
- Nickname
- License Status
- Active
- License Type
- Real Estate Salesperson
- PC/PLLC Name
- Original Date
- 9/17/2018
- Expiration Date
- 9/30/2028
- Valid Fingerprint Clearance Card
- Yes
Current Employer Details
- Employer
- REALTY ONE GROUP, INC. (CO578024013)
- Hire Date
- 9/4/2024
- Employment Type
- Salesperson
- Designated Broker
- COPUS, RONALD (BR004648000)
Employment History
| License Number | Legal Name | DBA Name | Employment Type | Hire Date | Sever Date | |
|---|---|---|---|---|---|---|
| View | CO578024013 | REALTY ONE GROUP, INC. | REALTY ONE GROUP | Salesperson | 9/4/2024 | |
| View | LC529224000 | MARTINEZRUSSO, LLC | RE/MAX PROFESSIONALS | Salesperson | 9/29/2023 | 9/4/2024 |
| View | LC529224002 | MARTINEZRUSSO, LLC | RE/MAX PROFESSIONALS | Salesperson | 10/29/2021 | 9/29/2023 |
| View | LC676821000 | LIBERTAS REAL ESTATE, LLC | Salesperson | 10/22/2019 | 10/29/2021 | |
| View | LC676821005 | LIBERTAS REAL ESTATE, LLC | Salesperson | 10/19/2019 | 10/22/2019 | |
| View | LC529224001 | MARTINEZRUSSO, LLC | RE/MAX PROFESSIONALS | Salesperson | 3/14/2019 | 10/19/2019 |
| View | CO530191004 | CALL REALTY, INC. | Salesperson | 10/23/2018 | 3/14/2019 | |
| View | LC583249000 | DECKER AND ASSOCIATES REALTY, LLC | Salesperson | 10/9/2018 | 10/23/2018 |
Continuing Education
The courses listed are for the last two renewal periods.
| Course Name | Date Started | Date Completed | |
|---|---|---|---|
| View | DO'S AND DONT'S OF AGENCY | 8/24/2026 | 9/8/2026 |
| View | FAIR HOUSING IN ARIZONA | 9/8/2026 | 9/26/2026 |
| View | PROTECTING ARIZONA FROM DEED FRAUD | 9/8/2026 | 9/8/2026 |
| View | ARIZONA COMMISSIONER'S STANDARDS | 9/8/2026 | 9/15/2026 |
| View | DON'T LET YOUR BUYER OR SELLER DEFAULT | 9/22/2026 | 9/23/2026 |
| View | RESIDENTIAL FINANCING IN TODAY'S ARIZONA MARKET | 9/24/2026 | 9/27/2026 |
| View | Firewise Community – Protecting the Public | 9/27/2026 | 9/27/2026 |
| View | WATER IN ARIZONA | 9/27/2026 | 9/27/2026 |
| View | FUNDAMENTALS OF SHORT SALES | 9/28/2026 | 9/28/2026 |
| View | LEADS, LISTINGS, AND LAW IN ARIZONA | 9/28/2026 | 9/29/2026 |
Complaints
There are currently 0 open complaints at the Department. Open complaints represent unproven allegations. Upon investigation many complaints are found to be without merit and dismissed. Open complaints are confidential and no information concerning them is available for release.
Disciplinary Actions
| File Number | Order Type | Order Date |
|---|