Mary DeVries is the founder of Abacus Real Estate. Drawn to the business after a decades-long career as a San Francisco-based architect and developer, Mary has a deep understanding of a building's intricacies, from the seismic to the stylistic. Using a distinctive skill set, including the ability to find data that many agents don't know how to look for, she guides her clients towards informed, intelligent real estate decisions.
I recently worked with Emily and Mary to sell two condo properties, and I can't recommend them highly enough. From our very first conversation through closing on both uni...
I recently worked with Emily and Mary to sell two condo properties, and I can't recommend them highly enough. From our very first ...
5.0
9/9/2026
• Mattie Burch
Bought a home in 2026 in Noe valley, San francisco, CA.
Emily & Mary found us our first apartment in Noe Valley and we could not be happier with it and the whole experience with them as our realtors. We would not have gotten i...
Emily & Mary found us our first apartment in Noe Valley and we could not be happier with it and the whole experience with them as ...
5.0
5/28/2025
• Zoe Bendes
Bought a Condo home in 2025 in Pacific heights, San francisco, CA.
Mary and Emily are the agents you want in your corner. As a first time home buyer, they were with me every step of the way. No question was too small and they spent many ...
Mary and Emily are the agents you want in your corner. As a first time home buyer, they were with me every step of the way. No que...
Emily and Mary with Abacus Real Estate were absolutely wonderful to work with from our first call with them. They have a great partnership with specialities in different ...
Emily and Mary with Abacus Real Estate were absolutely wonderful to work with from our first call with them. They have a great par...
5.0
8/7/2024
• user14282683
Bought and sold a Single Family home in 2023 in Outer sunset, San francisco, CA.
Mary has solid negotiation skills. She is a straight shooter who tells you like it is and will fight for you as a buyer or as a seller. She is someone to have in your cor...
Mary has solid negotiation skills. She is a straight shooter who tells you like it is and will fight for you as a buyer or as a se...
We have worked with Mary for a number of years and we have come to count on her responsiveness and hands on guidance in various transactions. In addition, we recently so...
We have worked with Mary for a number of years and we have come to count on her responsiveness and hands on guidance in various tr...
5.0
7/10/2024
• Sophie Bambuck
Bought and sold a Single Family home in 2022 in Inner richmond, San francisco, CA.
Mary helped us purchase our home in SF (Inner Richmond) and when we had to move to another state a few years later she also helped us sell the house!
Through both experi...
Mary helped us purchase our home in SF (Inner Richmond) and when we had to move to another state a few years later she also helped...
5.0
8/4/2019
• skssca
Sold a Condo home in 2019 in Sherwood forest, San francisco, CA.
Mary provided good council and guidance in the sell of our SF condo. She worked with us for over a year and patiently waited till we were ready to sell. Her advise nette...
Mary provided good council and guidance in the sell of our SF condo. She worked with us for over a year and patiently waited till...
Mary goes above and beyond to help her clients. She helped us sell and buy within a short time frame - and we could not have asked for a better experience. She's smart, h...
Mary goes above and beyond to help her clients. She helped us sell and buy within a short time frame - and we could not have asked...
5.0
10/9/2013
• ChristineSzekelyKenny
Bought a home in 2013 in Mission Bay, San Francisco, CA.
Mary's strength is in her background skills. Her architectural knowledge helps determine whether a property is worth investing. She was very helpful in negotiating terms ...
Mary's strength is in her background skills. Her architectural knowledge helps determine whether a property is worth investing. Sh...