Zillow is saying the house is worth $90k but recently a tree went through the back end of it and I was hoping to get some information on possible ideas or suggestions on what I should do about the situation.

The only inssue is that i have not found many people in the area that have done it and would like to ask if any one here has done ADU's in Orange County or Long Beach and has it been worth it for you . 

Can anyone give me advice on how to go about it if it's worth it?

It would not be unreasonable for this to be worth 2-2.5M 10 years from now.

Quote from @Louis Hamilton: The property is worth around 800,000 and has no mortgage on it.

It’s also worth noting that Waivo is a sister company to Proper Insurance, which I use for my STR.

The investor has to be gaining cash flow or equity to make it worth it.

That being said, there won't be any down payment required since you have equity (you're guessing ~55,000 but I wasn't sure if you were meaning the property is ballpark worth ~$175,000, or more than that). 

We were initially looking out of state for a potential move and or investment property just because the property taxes without being able to homestead, plus high cost of insurance, and harsh weather on homes made me feel like it might not be worth it.

Before jumping into the condo, I’d take a closer look at whether the $300/month cash flow is worth it compared to other options, like a small multi-family property or a property in a higher-yield market.