Know your numbers (costs) ahead of time for each stage of the process (buying, holding, rehabbing, selling).

They have no rush for me to move out, as I have a great relationship with them and my siblings, and I assist with household maintenance.Recently, a single-family home became available in the neighborhood, just a block over from my family's home and a minute from my workplace.

But if it is turnkey, I am assuming you will probably not be ahead on cash flow from your current property (and likely less).But I want to reiterate, if you say you are an investor and your focus is scale and number of doors, you are measuring the wrong metric.  

As the comment above stated you'll have to find your plans/strategy but I don't think it'll be a bad decision you may be ahead of the curve. 

I might get some arguments on this one, but I'd go ahead make some calls to see what happens.

Then go ahead and handle the listing and transaction yourself. 

If you are replacing a rent payment with this then 100% yes bc you will come out ahead.

I'm also of the mind that if your vacation rental is already ahead of the competition, do you absolutely need to invest in more amenities?

There is a lot of competition in CA and while a great appreciation market gone are the gold rush days of the last 10 years so the strategy has to get more creative.

In order to do this, you want to make sure your loan to ARV on your initial bridge loan, or loan to costs if using cash, are low enough for you to come out ahead on the refinance.