Service Areas
Benicia, CAConcord, CADanville, CAEl Sobrante, CAFairfield, CAHercules, CALafayette, CAMartinez, CAPinole, CAPleasant Hill, CARichmond, CASan Pablo, CAVacaville, CAVallejo, CAWalnut Creek, CA
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About Allison Costelow
Allison Costelow brings more than $15 million in local sales volume and two decades of combined healthcare and real estate experience. As a Seniors Real Estate Specialist® and Certified Probate Expert, she helps mature homeowners and families navigate downsizing, estate transitions, and new beginnings with clarity and compassion.
Community Involvement
I host free seminars and webinars--both online and at local community centers--for seniors and families on topics like downsizing, home safety, and aging in place, because I believe in serving my community beyond real estate. I walk with clients through emotionally and practically challenging transitions, especially for seniors and their loved ones, offering empathy, understanding, and expert guidance as an SRES(R). I'm also active in MomCo, a nonprofit community of mothers and families, where I contribute time and support its mission of connection and empowerment.
HOBBIES/INTEREST
when I'm not out there working hard for my clients, you'll find me exploring the outdoors, hiking local East Bay trails, or enjoying beach days with my husband and two girls.
FAMILY
Family is at the heart of everything I do. As a wife and mom of two, I understand how important it is to find a home that truly fits your family's needs and lifestyle. My own experience balancing family life keeps me grounded and reminds me that home isn't just about real estate--it's about connection, comfort, and creating lasting memories together.
Read More About Allison
Specialties
- Sellers
- Buyers
- Rentals
- Residential Property
Recent Sales
Showing 4 out of 7
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- 1. Click the "View All Sales" button below.
- 2. Use the "Year" filter to select the desired past years.
Date
Address
Price
Represented
08/26/2025
2765 Tuolumne St Vallejo, CA 94589
Sold For $435K
08/26/2025 Buyer
02/27/2025
101 Bahia Vista Ct Vallejo, CA 94591
Sold For $681K
02/27/2025 Seller
02/25/2025
307 Cottonwood Dr Vallejo, CA 94591
Sold For $435K
02/25/2025 Seller
12/31/2024
1779 Lindo St Benicia, CA 94510
Sold For $605K
12/31/2024 Seller
Allison Costelow's Reviews & Ratings
What clients say about this agent....
- Communicative
- Responsive
Astridsmusic4jc
Review for Member: Astridsmusic4jc
August 12, 2025
Local Knowledge
Process Expertise
Responsiveness
Negotiation skills
ZillowVERIFIEDAllison was wonderful to work with. She helped us purchase our first home in 2023. Allison was so helpful navigating us through all the big questions and explaining the process, getting us connected with the correct people and overall made the home buying experience less stressful. She was encouraging, on top of the paperwork, walk throughs, knew our expectations as well as the sellers so that we could get into escrow and close quickly. We highly recommend her! If you are looking for an agent in the Bay Area, Allison is your girl.
Contact Information
Location
426 First StreetBenicia, CA, 94510
