About Katharine

Responsive...I listen to your specific wants and needs! Knowledgeable...About the market, neighborhood and the complex details of real estate transactions! Creative...I find solutions! Aggressive...Strong representation on your behalf!


I will serve your real estate buying and/or selling needs for all of Sonoma County. Not only is purchasing a home a stressful event, it's a critical financial transaction that takes knowledge and experience. I can help with your unique needs.

Most of my business comes from satisfied buyers and sellers. I work hard to earn your referrals today and in the future.

Call me for your real estate needs or to refer someone at (707) 888-9185 or email me at Kat@OwnSonoma.com.

Interest rates are low. This is the best time to buy Sonoma County Real Estate in decades!
Looking for a great deal? Let me save you time and money!

There is still money to be made. Negotiations are important and I'm in your corner. You can still have a net gain that is substantial. The market is moving once again! Look to me to find you a qualified Buyer who can close.

~Aggressive Marketing and Advertising Expertise.
~"Motion Marketing" System of Advertising
~Five Star Technology Training
~Member of Marketing Masters/ Santa Rosa.


"I wanted to take this opportunity to thank you for your help on the purchase of my house. Your professionalism and experience are evident, with the entire transaction going smoothly and quickly. Thank you again."
Tracy Sheppard
"We highly recommend Katharine Breithaupt for the maximum in real estate services. She went above and beyond in her protection of our interests while getting us top dollar."
Larry & Louise Moskowitz

"Katharine is an exceptional real estate agent. She was very attentive to what my husband and I were looking for in a home, and worked ceaselessly until she found it. She navigated the complexities of the market and contracts with professionalism and expertise getting us the best deal and home available."
Joan Levy & Gary Iacini

"It would be difficult to find someone as capable as Katharine to handle the purchase of a home, qualified, aggressive and highly recommended."
Mrs. Mary Bonino

"Katharine went well beyond the "call of duty" in helping to represent us as new buyers. Her professional business acumen and negotiating skills helped save us substantial money."
Mr. & Mrs. David Miltzer

" Thank you for always going that extra mile for us- before, during and even after our home buying experience. All real estate agents are not the same!"
Mr. & Mrs. Murch

"Katharine helped me sell my house. Her professional manner and real estate skills made a tough time easier to bear."
Rebecca Henkels

"Whether selling a home or income property Katharine gets results- the most money in the shortest amount of time. Her marketing skills are above and beyond what anyone else offers."
Rob McGuire

"Katharine's marketing system helped get our million plus home sold quickly with minimum hassle. Her "Big Bang" targeting made the difference at a time when the supply of homes was huge."
Mr.& Mrs. Bob Smith

"I was so thrilled with Katharine's services; I will definitely use her again."
Ellen Tyler

"From day one of the listing Katharine worked non-stop to get our house sold. She used her extensive marketing and networking skills to make sure our house 'stand out' among the hundreds of others in the same price range. She spared no expense for large newspaper ads, web presence, and other advertising. Also her dedicated support staff made sure all 'back-office' work was done flawlessly. In this difficult market, any agent can 'List' your home, but only very few agents can actually 'Sell' your home, and Katharine Breithaupt is one of these few agents."
Inge Weidmann & Gesa Jurgensen

"Kat Breithaup of Synergy was our agent for our recent home purchase in Santa Rosa. She was great. We were looking for someone who would not pressure us, who would not show us properties above our budget, and who would help negotiate a great price for us. Kat went above and beyond in helping us buy our home. We are grateful to her and would recommend her without reservation as an agent. If we ever need to sell the home we just bought, I won't hesitate in contacting Kat to represent us."
Anand P.