There is at least one other tax wrinkle in there...IF you continue to live there or retain a life estate to do so, then for some tax issues the gift is deemed to be incomplete since you did not part with dominion and control....it is completed if you die or give up any dominion and control. ...
I have no doubt there are lots of schemes on how to sidestep capital gains or transfer wealth ...especially in a high tax state like CA ...some work , others do not and many depend on your specific situation ....if son has the economic ability and desire to take over this house it's one thing , but that's apparently not your priority ...your desire is to get out rather soon and if possible minimize taxes on gain . ...not an easy quest ..