My 2 cents to the mix would be The ADU is the only way so far [SB 9 and 10 not withstanding] - You should be able to take the SFR and do an attached JADU up to 500 sq ft, then you can [lot size permitting and every city has its own code so do some research] another detached or even attached regular ADU - and as long as you live there as owner occupied you can live in the SFR part, rent out the ADU and JADU- the twist we do is to rent out 30+ days as a furnished rental.