Overview to Angel Island - Jocelyn Knight Photo.jpg
Overview to Angel Island - Jocelyn Knight Photo.jpg

About Us


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About Us


Thanks for stopping by. We are Tiburon Open Space (TOS). Since our inception, our goal was to permanently preserve the land in Tiburon, California known as the Martha Property. Well it took quite a while, but we finally accomplished that goal.

This property is among the last great urban open spaces in Northern California. Its 110 acres were privately owned for many generations, and majestically sit atop of the Tiburon Peninsula with remarkable trails and vistas and wildlife. Its forever views include the City of San Francisco, Angel Island, the Bay, the East and North Bay, and the Golden Gate Bridge. It has been at the center of many discussions, to say the least, and over a very long period of time.

We are delighted beyond measure to announce that after so much work it is done. Martha, her acres and her gifts now belong to each of us. Martha is open to us all…and forever.  

To to scores of people who have pitched in; to you who have shared and passionately believed in our vision - we are deeply indebted to each of you who have helped in any way that you could over all of these years.

You remind us, importantly, what a group of like-minded people can accomplish. You see, together this team has forever saved the land for public use and enjoyment - the land will be forever stewarded for generations of people and wildlife.

The TOS Committee—an all-volunteer group—now has one goal: Stewardship (to maintain and improve the open space land for everyone).

We would love your help. And, at the very least, we would love to talk about stewardship with you.

Should you wish to volunteer, have a question, comment, or donation, please contact Jerry Riessen at j.riessen@comcast.net He would love nothing more than to help you. You can also click on the donation tab on this site to make a donation.

All donations are made through the Marin Community Foundation and are tax deductible to the extent allowed by law. Your donations allow us to continue stewarding the property. 

If you'd prefer to donate by check, please mail your donation to: 

Marin Community Foundation
Tiburon Open Space
1550-G Tiburon Blvd, #614
Tiburon, CA 94920

MAKE CHECK PAYABLE TO: MARIN COMMUNITY FOUNDATION

IN MEMO LINE WRITE: TIBURON OPEN SPACE

Photography courtesy of Jocelyn Knight.