Carol Altwarg Realtor

09/19/2026

Explore the August 2026 market stats for Contra Costa County. Wondering how these trends impact your home’s value or your plans? I’d be happy to share insights.

09/01/2026

Get the highest price for your home! Find out what your home could be worth now.

If you're thinking about selling your home, finding out its value is the place to start! Get a valuation now!

08/21/2026

Here’s a quick look at the July 2026 market stats for Contra Costa County. Curious what this means for your home or your next move? Let’s connect.

08/18/2026

It could be the perfect time to sell your home! Get a quick estimate of your home's worth or call (925) 997-0400 for a quick chat.

If you're thinking about selling your home, finding out its value is the place to start! Get a valuation now!

08/04/2026

Want to know how much your home is worth? Find out now - Don't wait another day! 🗓️

If you're thinking about selling your home, knowing how much it could be worth is a great place to start! Get your estimate now!

08/01/2026

Sereno 1% For Good Charitable Foundation is honored to support Contra Costa County Community Awareness Emergency Response Group, Inc., an organization that is dedicated to educating the community, promoting emergency awareness, and fostering collaboration to help Contra Costa County prepare for emergencies.

Since 2012, over $7.5 million has been donated to more than 600 local organizations making a positive impact in the communities we serve through our Sereno 1% For Good Charitable Foundation.

07/21/2026

Get the highest price for your home! Find out what your home could be worth now.

Get the highest price for your home. Find out what your home is worth now.

07/18/2026

Our East Bay offices were honored to present a $10,000 check to George Mark Children's House, one of our Community Impact grant recipients.

Since 2012, nearly $7.5 million has been donated to more than 600 local organizations making a positive impact in the communities we serve through our Sereno 1% For Good Charitable Foundation.

07/16/2026

Take a look at the June 2026 market stats for Contra Costa County. If you’d like a personalized perspective on your neighborhood, I’m here to help.

07/10/2026

20 Years. One Mission.

It started over 50 years ago along a shared country driveway in what was still orchards, before it became Silicon Valley.

Two kids who became lifelong friends, long before they became business partners.

In the summer of 2006, that friendship became a business built on a simple conviction: that doing right by people was its own reward.

We didn't know then what Sereno would become. We just knew why we were building it. Now we live it.

Twenty years later, with over 650 agents, 20 offices, and over $7 million in charitable giving, we see our agents, clients, and communities that have grown alongside us, and we are humbled.

Thank you for making these 20 years matter.

— Chris Trapani & Ryan Iwanaga, Co-Founders