We booked the beautiful Ellen Kenna House as a corporate retreat for 12 people for a week.
Unlike a sterile conference venue the rich history and character of the house added a completely different dimension to the retreat.
There's *plenty* of space for workgroups as well as more personal breakouts sessions. I believe there might still be areas of the house we haven't explored.
The kitchen is superbly stocked - we had a gourmet chef come in one evening to prepare and host a very successful dinner.
It's walking (or running depending on your fancy) distance from Lake Merritt with restaurants and breakfast spots. There's quick access Uber in the area though. It's about a 9k/6m run from the house around the lake.
Would definitely keep this bookmarked for future trips! E.J. was a fantastic host.