Arlene Kostant

An innovative leader in family law, mediation and collaborative law in the San Francisco Bay Area

Helping California families resolve their problems out of the courtroom

For 33 years, Arlene Kostant has dedicated her legal practice to helping individuals, couples and families throughout the San Francisco Bay Area resolve their legal problems out of court. She is a big believer in and strong practitioner of the alternative dispute resolution techniques of mediation and collaborative law.

Arlene Kostant understands that every family law situation is different, presenting its own individual set of challenges. She listens to your concerns and tailors her services to meet your specific needs. From the initial consultation onward, Arlene gives you a full understanding of the applicable law and the possible outcomes of your case and guides you through the creative dispute resolution process ― to help you make the best and most informed decisions.

Arlene Kostant is a State Bar Certified Specialist in Family Law. She has earned the respect of both clients and peers in California’s legal community, achieving an AV® Preeminent™ Peer Review Rated by Martindale-Hubbell® — a distinction signifying particularly outstanding legal work, professionalism and ethical standards. She is regularly named a Northern California Super Lawyer, and was honored as one of the Top 50 Northern California Women Attorneys in 2006, 2007 and 2008, as well as one of the Top 25 Family Law Mediators in California by the San Francisco Daily Journal.

Dedicated to finding legal solutions that provide a respectful, fair, affordable and collaborative experience for her clients, Arlene Kostant assists you in the following areas:



This is an informal, voluntary and non-binding process. Arlene acts as mediator, or as a consulting attorney for clients in mediation, facilitating negotiations between the disputing parties and attempting to help them find mutually acceptable solutions to family law issues.


Collaborative Practice

In collaborative practice, parties pledge to not go to court, agree to an honest exchange of information, strive for a solution to their family law matters that takes into account their highest priorities, and acknowledges that their collaborative attorneys cannot represent them in any adversarial proceedings.


Family law

Arlene helps clients reach out-of-court solutions in the following areas: dissolution of a marriage or domestic partnership, premarital agreements, parenting agreements, financial agreements, support modifications and other family law matters.


Negotiation training

In addition to guiding families through the collaborative law process, Arlene Kostant does private negotiation training for law firms, collaborative practices and industry groups. She welcomes inquiries to set up training for your organization. Arlene is also an adjunct faculty member at UC Berkeley School of Law.



Get in touch

When you need experienced, innovative and respectful representation, please contact me directly or using the form below.

Law Offices of Arlene Kostant
220 Montgomery Street, 15th Floor
San Francisco, California 94104-3413

Phone: 415-433-2863 
Fax: 415-397-1577

Also seeing clients in Lafayette.