Even if I take the 15% tax hit I would make $32,000/ year on the remaining $400,000.    

When choosing tenants (I am in California), it's important to avoid even the appearance of discrimination, especially during in-person meetings.

OR even less risky is investing in bonds/CDs, etc.

First thing I'd look is the zoning for that property to ensure ADU/multifamily is even possible.

.: Quote from @Tom Gimer: You can't take an element from state X such as "uniqueness" and try to apply it in state Y where that appears not to even be part of the analysis.Let's see how this turns out. 

@Bayo Badejo, there are so many missing pieces here to even begin to give a real answer.What insights are you wanting?  

A realtor who understands the numbers can help analyze the property’s projected cash flow and ROI, plus they might know local leads from probate attorneys or even “drive for dollars” efforts that can reveal off market gems.

From there, I would start to run numbers on those deals in that area/streets, and then start to connect with local agents/PMs to get an even better feel for pricing on homes along with rents for them. 

I understand that not all deals pan out as pro forma says but at least yearly updates are essential, quarterly even better.

For that reason (& other reasons like no one was meeting even online), I started Real Estate Rocks.