I don't know what the housing stock is like out in LA, but in Denver and Colorado Springs, we find a good number of homes with basements that have a separate entrance so you can Airbnb or rent it separately while you're there.

If you're doing SFR or smaller MFR, I would think every 6-10 doors or $500k of value should be in a separate LLC. 

Keep in mind if these are 4 separate duplex’s then they are valued much differently than a true 8plex would be.

Take all 4 of your options and make 4 separate Facebook Marketplace ads.

If you pick tools that “play well with others” and connect to each other, you could have a system that you and your team uses that is separate from your accounting system.

Are water/sewer separately metered in the duplex?

Therefore the industry is fairly separated now for good cause. 

I spread bookings a bit longer apart than previously.We drive separately.  

in 2 weeks, reversing the method of applying for PPP loans/grants for partnership.https://home.treasury.gov/system/files/136/Interim-Final-Rule-Additional-Eligibility-Criteria-and-Requirements-for-Certain-Pledges-of-Loans.pdf"...However, if you are a partner in a partnership, you may not submit a separate PPP loan application for yourself as a self-employed individual.

I think most courts see that the tenant is acting on behalf of the landlord and not a separate entity hired to care for the property.