As a rental investment it is not worth the risk or work load based on you having negative cash flow unless you are in a high appreciation market and willing to gamble.SFHs make for poor income property investments and are primarily a appreciation play.

It sold in 2014 for 80k the estimate for its worth now is around 90k.

I have been approved to sell my property in Costa Mesa for $620k but I think it’s worth a lot more - any possibility to sell it to an investor to pay me more like “cash for key” ?

Numbers look right, but is it really worth it? 

You can keep records, mammograms, or other to document.In the meantime you can do whatever you want with the property you’re now the legal owner.

It may be worth just starting a new LLC fresh. 

Let's assume in 2020, when you're looking to sell, the house is worth $550k, but you only paid $250k and only have $100k left on the loan -  that's $300k of gain and $450k in equity.

There are plenty of goofy laws concerning security deposits that are not worth risking a couple hundred dollars for. 

I do think the OTA's are a threat to our businesses and I also like controlling my own destiny, but is it worth the time, effort, maintenance and cost to drive my own brand on the web? 

Yes you want to rent it quickly, but if you have to wait a little longer for a good tenant, it is worth it in the long run.