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The early years…  Joanne, a veteran real estate professional, has had houses on her mind most of her life.  When she was a little girl in the 1950’s she busied herself by drawing on brown paper bags.  One of her drawings was a floor plan, an outrageous design for the time considering that most houses consisted of two bedrooms and one bath.  Her floor plan featured three bedrooms: a parents bedroom, a boys bedroom and a girls bedroom; Two bathrooms: a parents bathroom and a kids bathroom; and two living rooms: an adults living room and a kids living room; and a garage attached to the house “so nobody gets wet in the winter. Years later that design became the standard for most home builders in the nation, what we in the real estate industry call a 3/2/2/FR. In Non-Realtor language it means: 3 bedrooms, 2 baths, 2 car garage and a family room.

Professional Philosophy…   The core of Joanne’s business philosophy is the spirit of the Golden Rule: Do unto others as you would want them to do unto you.

Joanne believes strongly in the traditional values of integrity, professionalism and accountability.

Dedicated to excellence, Joanne helps to keep her clients on the cutting edge of today’s real estate market. This provides clients an advantage over the ever changing and always challenging market conditions.

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Joanne Gardiner and Advantage Realty serve the greater San Francisco Bay Area with an emphasis on the East Bay.  Our location near the bay enables us to easily serve Alameda County, Contra Costa County, and San Mateo County.  Our primary service areas in Alameda County include:  Castro Valley, Dublin, Fremont, Hayward, Livermore, Newark, Niles, Oakland, Pleasanton,  San Leandro, San Lorenzo, Sunol, and Union City.  In Contra Costa County:  Danville and San Ramon.  In San Mateo County:  Belmont, San Carlos, Burlingame, Foster City, Palo Alto, and San Mateo.  


Zip codes for the primary areas we serve:  94540, 94544, 94545, 94541, 94542, 94543, 94540, 94557, 94587, 94536, 94537, 94538, 94539, 94555, 94560, 94577, 94578, 94579, 94546, 94552, 94583, 94582, 94566, 94588, 94506, 94526, 94568, 94611, 94610, 94602, 94618, 94619, 94605, 94501, 94502, 94404, 94010, 94301, 94302, 94303, 94304, 94306, 94309 

For information on buying or selling real estate in the San Francisco Bay Area, or to talk confidentially about your situation, please pick up the phone now and call Joanne on her cell phone: 510-589-4794 or send her an email: Click here.​

More about Joanne…


Year after year, for more than twenty years now, Joanne has consistently been a multi-million dollar producer in the Bay East Association of Realtors® Achievement club. She has reached the outstanding level of Grand Master.

Joanne holds a State of California Bureau of Real Estate Broker’s License #00822285 


  • Joanne is an e-PRO Certified Realtor®
  • Joanne is a member of Bay East Association of Realtors®
  • Joanne is also a member of the Bay East Multiple Listing Service
  • Joanne is a Legislative Liaison for the California Association of Realtors®
  • Joanne is a member of the National Association of Realtors®
  • Joanne holds a Notary Public commission and is a member of the National Notary Association 
  • In 2007 Joanne became licensed by the Department of Housing to sell brand new manufactured homes through ARM Homes.
  • Joanne has been a landlord since the 1970's and is a member of the Rental Housing Southern Alameda County and the California Association of Apartment Owners.


The types of real estate in which we specialize are:  Single family homes, duets, condominiums, townhomes, garden homes, PUDs, manufactured homes, mobile homes, and small residential income properties from duplexes up to complexes with 10 units.

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Joanne L. Gardiner, Broker, CA Broker License # 00822285


Our sister company:
ARM Homes
https://www.mobilehomelife.com

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Meet the Broker of Advantage Realty…  

Joanne L. Gardiner is a licensed real estate broker in California. Her California Bureau of Real Estate Broker's license number is 00822285. She entered the real estate industry in 1965 as a part-time agent while attending college.  After two years it became clear Joanne preferred helping people sell and buy real estate more than pursuing a degree in architecture.

Since those early days, Joanne has handled thousands of transactions involving single family homes, condos, townhomes, duplexes, multiple unit apartment complexes, and special use properties such as churches and mobile home parks.  Joanne has also sold hundreds of mobile homes and manufactured homes 


Joanne is dedicated to sharing her knowledge and experience with buyers and sellers to achieve the very best results for them regardless of the type of property they want to buy or sell.  With the pandemic Joanne has adapted her business and works mostly electronically.   While other agents have left the real estate industry, Joanne has remained a steadfast in helping cients realize their dreams of home ownership through her dedication, innovations and hard work.