Advice on Layout/Design: For those who have added ADUs, do you recommend standalone units, garage conversions, or a combination of both?

It could be something as simple as a toilet running. 

It is a simple value add.Get the permit and enjoy an easy value add (assuming it is close to $8k).good luck

Sometimes minor tweaks to the design can garner their support which is far better than having an adversary. 

And don't forget to factor in design/furnishings into your budget keeping in mind your ideal guest avatar.    

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

I know I can go through a lawyer but I was told it is a fairly simple process hence want to DIY.Regards,Xuming

During this time, we aimed to provide comprehensive support, including design, setup, and data-driven projections.

It can be a simple one page contract b/w you too at an agreed upon rate.

If you are new to this particular strategy, you might be confused, but this is just a simple strategy that you need to understand and be aware of, most particularly if you are an investor or a shareholder.