The benefit is point of entry costs are typically lower but HOA fees can eat up a lot of profits.

It is a 2 story building and the entrances for each unit are behind a front entry door that needs to remain locked.

An eviction attorney in your area will know the for-sure answer, but you'd likely just have to add "Unknown Occupants" to the forcible entry and detainer complaint so it includes anyone who might be there.

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But with that said, the SFV is a strong market for entry level homes and of course some luxury in areas along/south of Ventura Blvd, Woodland Hills, and into the Conejo Valley.

What is the barrier to entry for others to do exactly what you are doing?

Not bad for an entry level appliance suite.Kitchen cabinets will be next on the ordering schedule, with paint coming up soon.We are remaining ahead of our scheduled completion date of 9/30/17 and remain under budget.

If there is technically entry between the two (even if the entry stays locked), it's more or less back to a SFH. 

In Cupertino, CA I know due to setback distance across from Apple Spaceship, someone sought a permitted full basement with external entry 1500 sf, great room, huge quartz countertop and fire place. 1500+1500 sf. 

Get keypad bolt locks for entry ways and supply keys for each room if you are going the room by room route.