Why aren't you reusing the same LLC for subsequent flips? 

One advantage you sound like you have is that you'll be doing a lot of the work, so that gives you more margin than an investor who is hiring it all out.I definitely agree with your subsequent post that you learn by doing.  

The State of California's position has been that any capital gains accrued on California real estate will be subject to California tax upon the ultimate sale of the real property even if the investor had sold his or her California real estate and subsequently 1031 Exchanged into investment property located outside of California.

When you've established yourself in the first few deals with the money source, you can command a bigger share of the partnership in subsequent deals.  

They subsequently turned down a $50k offer to vacate.  

Take immediate action on any subsequent non payment.

Subsequently, tenants reported multiple plumbing issues, including some corrosion seen on the external of the water heater.

Are the subsequent year's taxes payed during the year waiting for redemption also subject to the 20% penalty and the 10% after the first year?

Once all the depreciation has been "recaptured", any subsequent receipts of principal are prorated between basis and profit.

If your notices don't take a progression approach (each subsequent one becoming stricter), then you want to get on that.