It would be worth paying for AirDNA for a month to analyze OC and get a good idea of yearly total income and occupancy for comparable units.

In addition, if you want to analyze and compare them; 1. 

My team particularly does have a handful of LA based investors because our market seems like a total bargain compared to what they're in currently.

SFH has been great but small change compared to the bigger potential out there.

Do you have any hard data to share and compare against the percentages in the BR calculator?

Section 8 pays very high for that area compared to the rest of Gardena.

Their sq ft and size/quality are comparable to the duplex. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

I want to minimize the headaches that come with rentals due to the unpredictable human element that comes with this type of investment.

(All rough estimates based off comparable properties in the area... and coming from a newbie, myself... so might be less.)THE ISSUEMy father owns the duplex outright with no outstanding mortgage or liens from taxes.