I’m in CA also and paid cap gains on huge profits to the tune of 28%, which included CA state cap gains.

There is a fine line between offering a well rounded service and leaving too much in the home.I love the business and glad to be a Superhost but this has been my experience.  

Having said that, the best course of action is to tell the tenant what day and time the appointment is and explain if she wants to be there for it that's fine, if she can't be there, that is fine too, the workers will be entering her property without her being there.

Do I have to give a tenant a written notice to vacate the unit upon lease end or is a text message fine?

Most neighborhoods you will be fine in.

I was fine with all these numbers.Then I met with contractors...First, I wanted to add a new bathroom and approximately 450 sq ft of additional living space.

@Lionel Quiambao I find that the most basic speed offering works fine in my units.

You feel you have to rebut my comment to bolster/protect your business that’s fine, but I would suggest you steer clear of exposing client financials unless your in the business of fighting legal suites rather than real estate. 

All your properties may be perfect but if you are transparent about why something is not in service, it makes sense, and they agree it works just fine for long-term rentals.

Fine.