COSA Convention Hotel Information

We welcome you to join us at the convention in Oakland, California.

Rooted in Recovery
May 25 - 28, 2018

The Washington Inn
495 10th Street, Oakland, California 94607

This year’s convention will be held at The Washington Inn, a boutique hotel in downtown Oakland, right across from the Oakland Convention Center and Marriott Center City Hotel. It is about a half-mile from Jack London Square, a waterfront gathering place with shops, restaurants and maritime activities.

Hotel reservations can be made with The Washington Inn at 510-452-1776 or Note: You must enter our Group Code (ISO18) in the box marked Group/Promotional Code or give the code to staff on the phone in order to reserve a room because our convention has reserved all 40 available hotel rooms. Our rate for the rooms is $129. (Because COSA is a non-profit entity, we will not have to pay room tax; however, the room tax will show on the bill until it is removed at checkout.)

Each room has one queen sized bed and includes continental breakfast, free wifi, and a discounted parking rate.

Reservation Deadline for this Rate: May 3, 2018

NOTE: Parking is $15 per day at Convention Center Parking lot across the street (if paid at The Washington Inn; otherwise $30 per day).


Questions about the Convention?

If you have any questions about this year's Convention,
please contact us at