Specifically for the missed items during the review prior to the initial call, as well as the piece on no action plan.

Our 4th Amendment Rights as landowners protect us against regulatory takings and that is why lots that were created prior to zoning or zoning changes are typically grandfathered.  

You can read a book and multiple books, but unless you are out there doing it (I.e. getting bids and getting contractors to truly get you an exact estimate) you will be far off from the numbers you want and may even lose money on the flip/rehab.The best advice I would suggest in my experience is that you should get into the line of work by either partnering with someone or working with someone on some projects prior to going into a flip on your own.

This does seem like a lot of communication, but I would have a conversation with the owner about this prior to firing.

The property can only be vacant for so long without notifying insurance so when the prior tenant moved out could be impactful here.

You need to trust your boots on the ground and verify they have prior brokerage experience and ownership experience.

I bought the main house as a fixer upper and forced a modest amount of equity prior to the construction of the ADU, I did not incur a negative equity position.

My bizz partner when I was doing timber in the 90s  prior to us doing our thing.. he had a Cedar shake mill.. things changed in San Jose area tile roofs are very prevalent. 

JWB spent $2,300 on renovations prior to you moving into the home. 

While this sum is not part of my main "nest egg," it represents a significant portion of funds from a prior investment.