If you are wondering why I have included a somewhat historically volatile asset class like commodities, it's because their values tends to be uncorrelated with the systematic risk adherent in the stock market and other asset classes. 

Notice, too, that all the colors I just listed are from the historical collection-- they tend to be safer because back in the time which the colors are replicating, they simply didn't have the pigments available to create extremely bright tones.   

I did expect it to be RS-4 because while only my parents occupy the building and only use the first level, there is a separate door for the ground/basement level and i do think historically (ie: many decades ago, it’s an early 1900s build) the house was used as a multi unit or was intended to be..however when I check the cook county property tax website, they do have the house listed as 2-11 for the property classification code which is a “multi family with 2-6 units” (instead of some the other 2- classifications that would be for a sfh).

Historically the attorney says it's very difficult to get an eviction for anything but non-payment of rent.You might get lucky if he registered his business name with the secretary of state and listed your property as the address of the business (very long shot).Is he damaging the property?

Use the equity now while rates are still historically low and and buy more investment properties to increase your long term income.

It’s cheap ($20/mo), you can have the buyer pay for it and they keep historical record for all payments and send out all end of year tax forms as well as billing statements etc.

I did want to add that this property was build in 1920 in a Historic District of San Diego.

We are in a historic low period for rates and it's a competitive market out there. 

Also, there have been un-permitted renovations without either city approval or historic district (hyde park) approval.  

Conventional, owner occupied, 5% down, during historic lows for interest rates.