I looked into this and FHA will allow this, also the new granny flat laws just went into affect for california allowing "accessory dwelling units" on SFR lots sized up to 50% the square footage of the primary residence.  

If it's zoned as a SFH and only has one APN lookup your local laws on 'Accessory Dwelling Units' it's entirely possible the conversion was unpermitted and you'll get in trouble/have to rip out the 2nd unit if any code inspector finds out about it. 

I think it depends on your market if the homes are flying off the market, you can do minimal staging (accessories) and it will still sell.

I have a similar setup, a large 4br home with an accessory or mother in law quarters in the back with a private entrance for both.

Or use a single family with an accessory apartment and make sure the accessory apartment is also done properly and permitted (and maybe put the renter there, not you)..... 

Would it be opening a can of worms to talk to the city about the accessory dwellings on the property?

That and accessories was going to be $1600.

Much related to California Senate Bill 1069 that went into effect on Jan. 1, 2017 which addresses the whole subject of affordable housing related to maximizing residential space with the installation of Accessory Dwelling Units ada ADU's, granny flats, etc.

Some “accessory units” often called in-law units are still covered under rent control despite having a certificate of occupancy issued after June 13, 1979.

For the purposes of this exemption a “Homeowner” is defined as follows: Person(s) who owns a parcel of land on which he/she resides or intends to reside on which there is, or is intended to be, a one or two family dwelling, attached or detached structures accessory to such use and/or farm structures.