This is the press page for Diamond Real Estate Group and its founder, Matthew Martinez: verified coverage, an approved biography, the topics Matthew can speak to with data behind them, and how to request an interview. Everything listed here links to the original source. We don’t list outlets that only republished a press release.
Coverage and announcements
| Date | Outlet | Item | Type |
|---|---|---|---|
| 2024 | North Bay Business Journal | Forty Under 40 winners for 2024, listing “Matthew Martinez, CEO & Real Estate Broker, Diamond Real Estate Group” | Editorial recognition |
| 2024 | North Bay Business Journal, via The Press Democrat | Forty Under 40 profile of Matthew Martinez, by Gary Quackenbush | Editorial profile |
| September 8, 2022 | EIN Presswire | Release on Matthew’s use of social media and technology | Company press release |
A note on that last item: a distributed press release is written by the company. Wire services often repost releases on partner sites, and those reposts aren’t independent coverage, so we don’t present them as such. Any older claims in the release, such as follower counts, describe 2022 and shouldn’t be read as current figures.
Approved biography
Short (about 45 words)
Matthew Martinez is the founder and CEO of Diamond Real Estate Group, a boutique brokerage in Sonoma County, California, and a licensed California real estate broker. He works with buyers, sellers and investors across the North Bay on homes, land, vineyards, multifamily and commercial property.
Long (about 100 words)
Matthew Martinez is the founder and CEO of Diamond Real Estate Group, a boutique real estate brokerage in Sonoma County, California. A California real estate broker (DRE #01869679), first licensed in 2010, he represents buyers, sellers and investors across Sonoma, Napa, Marin and the greater Bay Area, with particular focus on vineyard and winery property, bank-owned homes and short sales, and investment property. Before real estate he worked in sales and marketing, and he describes his approach as data-driven. The North Bay Business Journal named him to its Forty Under 40 in 2024. He writes the buyer and seller guides published at diamondgroupestates.com/.
The full profile is on Matthew Martinez’s page. Please use the biography as written, or check edits with us, so that titles and facts stay accurate.
Topics Matthew can speak to
Each topic below has a published guide behind it, with sources, so reporters can check the background before or after an interview.
- The North Coast vineyard market after the 2025 harvest: falling grape prices, vineyard removals and what they mean for land values. Background: vineyards and wineries for sale in Napa and Sonoma and how vineyards are valued.
- Buying and selling vineyard property: water, permits, grape contracts and the crop at closing. Background: buying a vineyard.
- Foreclosures, short sales and bank-owned homes in California: how the process works and what buyers and owners should expect. Background: the REO and short sale buying guide and the California foreclosure process.
- Technology wealth and Wine Country property: what founders, executives and investors look for in Napa and Sonoma, and how they buy. Background: AI founders and investors buying in Wine Country.
- How agents use AI in practice: where it saves time and where judgment still decides the outcome. Background: Matthew’s essay the biggest AI productivity gain is knowing what to do next.
- Co-ownership and second-home rules: how Pacaso and similar models fare under local rules in St. Helena, Sonoma and the county. Background: Pacaso co-ownership in Napa and Sonoma.
- Housing in Sonoma Valley and the North Bay: prices, inventory, rules for second homes and vacation rentals. Background: Sonoma real estate.
Matthew comments on market conditions and process, not on specific clients or transactions without the client’s written permission.
Company facts
| Company | Diamond Real Estate Group (website: diamondgroupestates.com/) |
|---|---|
| Founder and CEO | Matthew Martinez |
| Based in | Sonoma County, California |
| Counties served | Sonoma, Napa, Marin, Mendocino, Solano and San Francisco |
| Property types | Homes, land, vineyards and wineries, multifamily, commercial and bank-owned property |
| License | Matthew Martinez, California real estate broker, DRE #01869679 (DRE record); Diamond Real Estate Group is his registered business name |
The data behind our market commentary
When Matthew gives a number, it comes with a source and a date. These are the main ones we use, so you can cite them directly:
- Grape prices and tonnage: the California Department of Food and Agriculture’s annual Grape Crush Report, published by USDA NASS. The final report for the 2025 crop came out on April 30, 2026.
- County farm values: the Napa and Sonoma county agricultural commissioners’ annual crop reports.
- Home sales: the California Association of Realtors’ monthly county figures and MLS data for individual towns.
- Rules and procedures: the agency or statute itself: county planning and agriculture departments, the State Water Board, the California courts’ self-help center, HUD, Fannie Mae and Freddie Mac.
If we’ve made an error in a published guide, tell us and we’ll correct it and update the review date.
Market facts reporters ask about
A few current, sourced figures that come up often. Each links to the guide that explains it.
- Napa County grapes averaged $6,635.85 a ton in 2025 and Sonoma and Marin $2,762.88, down 5% and 6% from 2024, according to the final crush report (vineyard market overview).
- About 2,700 bearing acres of Sonoma County vineyard were removed between October 2024 and August 2025, in a report commissioned by the California Association of Winegrape Growers.
- Most California foreclosures are nonjudicial: a trustee sells the property after a notice of default and a notice of sale, without a court case (how the process works).
Photos and logos
Ask through the contact page for an approved headshot of Matthew and the Diamond Real Estate Group logo for editorial use. Please don’t use property photos from our listings without asking, because rights to listing photography usually belong to the photographer or the seller, not to us.
How to request an interview
Send your request through the contact page with:
- Your name, outlet and the story’s topic
- Your deadline, with time zone
- The format: phone, video, in person or written answers
- Whether you’ll quote him by name and whether you plan photos or recording
For background you can get from the guides above, start there; we’re happy to confirm figures.
Questions reporters ask
Can Matthew comment on a specific property or sale?
On public facts, such as a listing price or a recorded sale, yes. On a client’s situation, only with that client’s written consent.
Can we use figures from your guides?
Yes. Please cite the original source shown in the guide’s sources list as well as the page, so readers can check them.
Does Diamond Real Estate Group pay for coverage?
The 2022 EIN Presswire release was distributed by the company. The North Bay Business Journal items are editorial. We label every item on this page by type.
Sources & notes
- North Bay Business Journal: Forty Under 40 winners for 2024
- The Press Democrat: Forty Under 40 profile
- EIN Presswire: company release
- CDFA: Final 2025 Grape Crush Report
Coverage list last checked October 2026. If you’ve covered Diamond Real Estate Group and don’t see it here, let us know.
