I'm an Architect and MRED Grad and have entitled and permitted over 200 units across Bay Area and Norther California, ask me anything about SB9 or ADU design / permitting

Need to be sure you include the "unknown budget" and never take the optimistic approach as it is better to have money left at the end than writing more and more checks that were unplanned for.Again, if you can walk through an actual property and compare notes with someone that does it in your area (key factor), you will be way ahead of what a generic book can give you.

Nonetheless, I am not out to impugn anyone's intentions and I do understand (as Jay rightfully points out) that the self-employed (my situation for the past 20 years) especially run into times in their lives when conventional lending sources are of no use due to limited reportable income and other factors (such as when, for example, you retire in your 50's and begin to live off of your lines of credit, etc.). 

Decide howto react to annoyed neighbors or police interventions.Will you design your apartment for a group of gamerfriends or an aspiring musician looking for a newhome?

People will start to realize that a law designed to protect against criminal international money laundering captures more innocents than anything. 

Those that use PM's have pointed out that there is a cost factor of also having to manage your PM as well - following up behind them, making sure they are doing what they are supposed to be doing, etc.Hope it helps!

It's crucial to keep investors informed about these factors and help them understand the rationale behind our long-term strategies.

Doing a short term rental in a separated area that has its own designated, kitchenette and bathroom, would likely give you better returns and less headache.

I have 3 family apartment building and a SFH with 4 garages, 1 shed, and 4 outside designated parking spaces for sale for 1.75 million. 

Congrats, love the design!