Congratulations on being in a positive equity position. 

I realize options may be limited here in the Phoenix area (only two I know of in Phoenix & Chandler with storefront units), but if anyone could point me in the right direction (on either (1) what to search for, or (2) any existing properties to look at), it would be much appreciated!

Depending on location (state) there are options for 80% cash out with no seasoning as long of proof of rehab is provided.

What are some different options to get about $300k for for the construction which should take less than 6 months to complete and get the refi?

Maybe less)(the extenuating circumstances would be lay off's during covid)BACK STORY- i was about to file my chapter 7 bankruptcy, I looked through all the positives and negatives (so i thought).

The one I used was the University of Michigan Credit Union.The loan to value is lower on investment property but if you have a strong equity position it makes sense.Then, the blended rate between your HELOC and primary loan is still better than the rate on a cash out refinance.Plus, the HELOC is flexible and can be used over and over if you pay it down and you have no payments until you use it.Dry powder waiting for the right opportunity.To Your Success!

I have been investing in options for about 10 years now. 

I don’t anticipate buying in SC so this will be my only property for at least 3 years (the length of my new position there).9.

What are the other options for the property that can generate the most income?

This is a good option.