The LaHaye Team

Experience has indeed been one of our teachers for working in the Real Estate industry.

Our Philosophy

Experience has indeed been one of our teachers for working in the Real Estate industry. This combined with continuous formal education gives us the strength, guidance, and knowledge to assist our clients in their journey. We have deep compassion for our clients’ individual journeys and will tailor each transaction to accommodate you the very best we can.

Client experience is a broad category, but be assured, no matter where you lie on the knowledge chart we service our clients with the utmost care. Integrity is key for our team and we pride ourselves on always doing the right thing no matter how difficult it may be. We also know that people rarely succeed unless they have fun in what they do. Our enjoyment comes from working side-by-side with you to successfully accomplish your goals. This is the “LaHaye Team.”

We Make Buying & Selling Easy

Leading the Real Estate Market in Lafayette, Walnut Creek, Concord & Beyond

Buy a New Home

End the cycle of bidding and losing. When inventory is limited and competition is intense, we put experience on your side. We’re skilled negotiators, fluent in East Bay real estate trends, and know how to write winning offers.

Buy with Us 

Sell Your House

Getting your home in shape to sell and setting the right price can be overwhelming. But it doesn’t have to be. We provide concierge service backed by decades of experience in prep, pricing and marketing to boost your profit.

Sell with Us 

Mary Anne LaHaye

REALTOR® | LaHaye Team Leader


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Julie Sullivan

REALTOR®, LaHaye Team


Email Julie

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Years combined experience

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Top 13% of teams in Contra Costa County


Top 100 in sales volume

Happy Clients

Julie spent an extraordinary amount of time dealing with a difficult transaction and disgruntled heirs. She did an exceptional job, above and beyond what anyone could reasonably expect from their Realtor. I’d recommend Julie to anyone! Thanks!

Loren Barr, Barr & Barr Attorneys – Danville

In my book, Mary Anne is a real professional with outstanding service. I was very impressed with her concept of selling my house, and she did it so fast!


Julie worked hard with our lender and Title Company to make sure escrow closed on time. She spent time helping us find the right home and we never felt rushed or pushed. Since this was my first home purchase and my wife’s second, she really helped guide us through the transaction process from making an offer to close of escrow. Julie even followed up with us after the home purchase to make sure things were going well.

David & Claudia Bean

With Brian overseas I was overwhelmed with getting the house ready and you stepped up and handled so much for us. From start to finish you took such great care of the transaction and us. Thank you!

Brian & Alice

Mary Anne was so dynamic she took care of every detail – we did not have to worry about anything. Mary Anne has been the best agent I have ever used in any of the 5 moves I have made.

Cleo & Ann

When Mary Anne talks, people listen! Her knowledge and experience are respected by both her clients and the local real estate community. When faced with a problem, I am always amazed at Mary Anne’s ability to look at all sides on an issue to find the best outcome for her clients. If I wanted to build the ideal real estate professional I would just copy Mary Anne!

Bob O’Grady

Choosing Mary Anne LaHaye for our realtor was, undoubtedly, the best decision we could have made in selling our Pleasant Hill home! She gave us exactly what was promised and then some. We moved out of state and left Mary Anne in charge of doing a full remodel on our vacant home, knowing we weren’t going to be able to oversee any work. As a General Contractor, this was very difficult to hand over. Mary Anne’s expertise in project managing the job, along with her keen eye for designing, marketing, and staging our home, netted a result that brought us 8 offers in 36 hours, with a sold price that was significantly over asking. Her knowledge of the law and constant encouragement to disclose all and forget nothing was refreshing. Her advice to list the property based on comps and not what we hoped it might sell for was spot on. We found Mary Anne to be honest and professional, with a no-nonsense attitude, yet personal. Everything she did to ensure a successful sale of our home far exceeded our expectations. We very highly recommend Mary Anne!

– Ron & Lisa


Mary Anne was an exceptional partner. She was so detail oriented, patient, kind and a complete pleasure to work with. This is my second experience buying a home and she was diligent in ensuring I knew what was happening every step of the way. Everything was explained and there was nothing unexpected. I am grateful to have gone through this experience with her and would recommend her to anyone looking to buy or sell. I felt like I had a partner and an advocate and I am very grateful!

– Jen C

If you are in the market for a realtor, we can totally recommend Julie Sullivan of Abio Properties. Although I have known Julie personally for years, this was my first opportunity to work with her in a seller/realtor relationship. It could not have gone better. From the beginning, Julie  took the time to explain each step of the process. She walked us through the ins and outs of inspections, and disclosures and kept tabs on all parties, processes and reports. She held our hands when we had the normal 2nd thoughts and waited patiently till we knew for sure we were ready to move forward.  The week we listed the house, we left town for 2 months. We could never have done that without the trust and comfort we had in working with Julie. She kept us up to date on all the opens and private showings and shared feedback. When an offer came in, she helped us through understanding all the details and the countering process. We had the luxury of doing this all long-distance. Julie has been a real professional. It has been our pleasure  to navigate this adventure under her careful guidance.

– David and Siobhan Hampton

Featured Properties

$3,400,000 | Sold $3,250,000

2517 Biltmore Drive, Alamo, CA 94507

6 BD

4.5 BA

5800 SF

$1,199,000 | Sold $1,325,000

507 Peppertree Road, Walnut Creek, CA 94598

4 BD

2.5 BA

1828 SF

$949,000 | Sold $1,100,000

241 Mountaire Circle, Clayton, CA 94517

4 BD

2 BA

1740 SF

Areas Served

Contra Costa County
  • Alamo
  • Clayton
  • Concord
  • Danville
  • Hercules
  • Lafayette
  • Martinez
  • Moraga
  • Orinda
  • Pleasant Hill
  • Richmond
  • Walnut Creek

Connect with Us

The LaHaye Team

An Abio Team



Email The LaHaye Team

Mary Anne LaHaye

REALTOR® | LaHaye Team Leader



Email Mary

Julie Sullivan

REALTOR®, LaHaye Team



Email Julie

Contact The LaHaye Team