Russ Lyon Sotheby's International Realty
The Arizona Department of Real Estate record retrieved on 2026-10-30 lists Russ Lyon, LLC, DBA Russ Lyon Sotheby’s International Realty, branch LC646682008, Active, at 3450 E. Sunrise Drive Suite 150, Tucson, AZ 85718.1
Real Estate Industry Reviews Editorial Team Updated 2026-10-28 blog.russlyon.com/75-years-serving-arizona/
Overview
The Arizona Department of Real Estate record retrieved on 2026-10-30 lists Russ Lyon, LLC, DBA Russ Lyon Sotheby’s International Realty, branch LC646682008, Active, at 3450 E. Sunrise Drive Suite 150, Tucson, AZ 85718. It names Debra M. Quadt as branch manager and Bret Gambs Lamberson as designated broker. The firm’s blog says Russ Lyon founded Russ Lyon Realty in 1947 and names Tucson among the places the firm serves. russlyon.com did not return a street address when it was opened the same day, so the street address is the license record. The Oro Valley branch on a separate record, 405 W. Tortolita Mountain Circle, is Terminated, so it is not on the Oro Valley hub. License and the 1947 year are the two sourced criteria. Exactly two sourced criteria cap the published score at 9.0.1
Score breakdown
| Regulator or license record | 10 |
| Professional directory | Not published |
| Years in business | 10 |
| Public reviews | Not published |
| Dated operating figure | Not published |
| Overall score | 9.0 |
| Criterion | Weight | Points /10 | Weight × points | What we found |
|---|---|---|---|---|
| Regulator or license record | 25 | 10 | 250 | Arizona Department of Real Estate, retrieved 2026-10-30: Russ Lyon, LLC, DBA Russ Lyon Sotheby's International Realty, Tucson branch LC646682008, Real Estate Branch, Liability, status Active, original date 2/12/2013, expiration 8/31/2027, 3450 E. Sunrise Drive Suite 150, Tucson AZ 85718. Phone (520) 742-1335. Designated broker Lamberson, Bret Gambs, BR533835000. Branch manager Quadt, Debra M, BR549321000. The page says there are currently 0 open complaints. The active record names the firm (10 points). A separate Oro Valley branch, LC646682024, at 405 W. Tortolita Mountain Circle, Oro Valley AZ 85755, was retrieved the same day and its status is Terminated. That branch is not listed. Arizona Department of Real Estate entity license, Russ Lyon, LLC, DBA Russ Lyon Sotheby's International Realty (Tucson branch LC646682008), retrieved 2026-10-30, Arizona Department of Real Estate entity license, Russ Lyon, LLC Oro Valley branch LC646682024, status Terminated, retrieved 2026-10-30 |
| Professional directory | 20 | — | Not scored. No NAR, IREM, NARPM, SIOR, CCIM or comparable listing of a named principal was read. | |
| Years in business | 20 | 10 | 200 | The firm’s blog says Russ Lyon founded Russ Lyon Realty in 1947. Age from 1947 to 2026 is 79 years, the 20-or-more band (10 points). That page is the firm’s, so it is not an independent source. Office and advisor counts in that post are not a current operating count. Russ Lyon Sotheby's International Realty blog, 75 years |
| Public reviews | 15 | — | Not scored. No third-party page that states a star rating and a Google review count was read for the Tucson office. | |
| Dated operating figure | 20 | — | Not scored. The blog gives office and advisor counts as of 2022. That is not a current dated operating count. Russ Lyon Sotheby's International Realty blog, 75 years |
Math: 450 weighted points ÷ 45 = 10.0, then capped at 9.0 / 10 because exactly two criteria are sourced. A 10.0 needs at least three sourced criteria. Evidence: Moderate. This is the section evidence rubric, not the public-record rubric and not the boutique rubric. Bands.
Each criterion is defined on our methodology page.
Leadership
Debra M. Quadt, Branch manager, Tucson office. Not a ranking.
Orientation
Sotheby's International Realty affiliate, Tucson office.
Services listed in the sources cited on this page: residential sales.
Main competitors
The Tucson city page lists Russ Lyon Sotheby's International Realty with Oliver Realty (8.7 / 10), Long Realty (9.0 / 10), Tierra Antigua Realty (No score published), Realty Executives Arizona Territory (No score published), Coldwell Banker Realty (No score published), Keller Williams Southern Arizona (No score published), OMNI Homes International (No score published), Engel & Völkers Tucson (No score published), and Realty ONE Group Integrity (No score published).
Pricing
A fee schedule is not published in the sources cited on this page, and no pricing URL is published.
How to engage
| Official website | https://blog.russlyon.com/75-years-serving-arizona/ |
|---|---|
| Pricing URL | not published |
| Services listed | residential sales |
| Last verified | 2026-10-28 |
Competitors
Compared with
Reviews
No client quotes were read for this profile.
Fact file
| Item | What the source says | Source |
|---|---|---|
| Tucson branch on the Arizona record | LC646682008, Active, expires 8/31/2027. 3450 E. Sunrise Drive Suite 150, Tucson AZ 85718. Phone (520) 742-1335. Branch manager Debra M. Quadt, BR549321000. Designated broker Bret Gambs Lamberson, BR533835000. The page says there are currently 0 open complaints. | Arizona Department of Real Estate entity license, Russ Lyon, LLC, DBA Russ Lyon Sotheby's International Realty (Tucson branch LC646682008), retrieved 2026-10-30 |
| Founded | The firm’s blog says Russ Lyon founded Russ Lyon Realty in 1947. | Russ Lyon Sotheby's International Realty blog, 75 years |
| Oro Valley branch | LC646682024, 405 W. Tortolita Mountain Circle, Oro Valley AZ 85755, status Terminated. Not listed on the Oro Valley hub. | Arizona Department of Real Estate entity license, Russ Lyon, LLC Oro Valley branch LC646682024, status Terminated, retrieved 2026-10-30 |
Methodology and sources
Method note and sources
This score uses the section evidence rubric. A number is published only when at least two criteria are sourced and one of those sources is independent of the firm. A firm with only two sourced criteria is capped at 9.0, and a 10.0 needs at least three. A criterion without a source stays blank. Zillow team figures are not a score input.
Sources
- Arizona Department of Real Estate entity license, Russ Lyon, LLC, DBA Russ Lyon Sotheby's International Realty (Tucson branch LC646682008), retrieved 2026-10-30 Accessed 2026-10-30.
- Arizona Department of Real Estate entity license, Russ Lyon, LLC Oro Valley branch LC646682024, status Terminated, retrieved 2026-10-30 Accessed 2026-10-30.
- Russ Lyon Sotheby's International Realty blog, 75 years Accessed 2026-10-30.
- Arizona Department of Real Estate individual license, Quadt, Debra M (BR549321000), retrieved 2026-10-30 Accessed 2026-10-30.
Last verified 2026-10-28. Each linked page was read on the date in Sources. A criterion without a source stays blank. Zillow team figures are not a score input.
View changelog
- Profile published from the sources cited below. A section evidence score is shown only where at least two criteria are sourced and one of those sources is independent of the firm.