Thanks to Willy Nevin now there is a 200k Permanent that starts and ends in San Francisco.
This ride starts at Ft Mason where there is a Safeway to check in. (Control 1) ride to Nicassio then out to Petaluma for control 2 from Petaluma to Valley Ford for control 3 Valley Ford back along Hwy 1 thru Tomales and Pt Reyes Station for control 4 then back to Ft Mason thru Samual P Taylor Park for a total of about 203k.
This Permanent is available year-round and the fee in $15.
You can see the RUSA page for this Permanent here.