https://www.amazon.com/Start-Strategy-Design-Portfolio-Long-... 

Most take near a year in southern Ca, but you hear of exceptions in both directions on that timeline.What some developers are doing here is leveraging the affordability issue and getting permission to build additional ADUs by designating some as affordable or semi affordable units.  

The key difference, though, was he spent months carefully getting to know the local architecs, reputable builders, and even a couple of niche design firms that specialize in modern builds for mid- to high-end buyers.

If you can design something like that and hit those rental numbers than you're going to be very, very happy with the investment. 

Also you could start with local Plan-printing companies as they're always printing plan sets for architects and designers before they go to county and after the county comes back with changes.

You interior design definitely needs work.

If you want to change the design, then do upon closing.

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BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

Please note the information provided below is a layman's definition designed to provide a basic understanding for the general audience.