The Downtown San Mateo Association (DSMA) is a coalition of San Mateo businesses owners who promote business and civic activity and improve the downtown experience for all. It is a 501(c) 6 non-profit corporation. Businesses located within the Downtown Business Improvement District geographic boundaries are automatically enrolled through a fee on their business license. Associate members, community partners, and sponsors also support the DSMA in a variety of ways. To learn how you can participate, please call 650-342-5520 or email us.