My tenant has been living in the condo for over a year and is out of the hospital and back at the condo.The new outside fire door costs over 3000 USD.  

This would offer you the lowest out of pocket cost.

The buyer wanted to double close so that was an additional cost.

Keep in mind, taxes and insurance costs in California are higher than a lot of areas.

If you want to wholesale and learn about rehab costs and acquisition, find the best wholesaler in your area, who is reputable (hard to find), and see what you can do for them.Don't try to do it on your own.

Doing your own general construction for a rehab project can have several advantages but can be very costly attempting  without having knowledge and experience.1.

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

I am opening a business in Mexico city (Hair salon) for my wife so get some short term income, Also I am heavily invested in the US stock market but at this time it is not going no where until we have some rate cuts. 

My yearly cost to run my STR is $30k and I've been bringing in $100k for the last 2 years.

The assets are old, need work constantly, the cost of living is high, and there is no job growth.I wouldn't solely focus on cash flow.