I would've like to make my case of being grandfathered in for the simple fact that the previous owner (whom is close to 80 years of age and self managed as Owner Occupied for over 35 years) had tried in the past:  1st - To reduce taxes because it's listed as a 3 & 2 but then the tax site has it as 6+ and when the old man had them visit the buildings they seen 7 mailboxes that USPS installed( so he decided to stay shut and not pursue it) 2nd- The 2 family already had 3 gas meters and even a fire escape because the 3rd floor studio apartment only has access thru back door.The front building has 4 gas meters, 1st floor, 2nd floor, 3rd floor and one for the front Studio apartment (which is like a basement apartment) but its street level with main entrance off sidewalk. 

For a legitimate emergency you gain entrance with your key or you disable unauthorized locks.

I'd love to hear some perspectives on entrance strategy in this case.

Property was a perfect match to accommodate 2 units as it had 2 separate entrances, 2 driveways and 2 AC unitsIn an up & coming LA neighborhood How did you find this deal and how did you negotiate it?

Basement is finished with a kitchenette, bathroom, small living area, small bedroom and a separate entrance.

Also, are there any rules/regulations that I would need to be mindful of if I chose to, for example, buy a house with a basement and separate entrance to rent out? 

I figure I could make half of it an ADU and then potentially rent out the other half of the basement to my "roommate" even though they have their own space with a separate entrance.

Sell our house come February, buy another primary residence that has room for rental income (i.e. space for ADU, downstairs with separate entrance). 2.

The property had a finished basement with a walk-out that we could use as a separate entrance for AirBnB guests.

@Glenna Wood What was odd about this new construction site is that they have created rooms on the first floor with their own entrance, kitchenette, and laundry room for the purpose of airbnbing, but after talking to the sales rep some more he said that you can only airbnb while living in the unit.