In an appreciating market, refinancing your value added property might allow all original capital to be extracted.

This is more true because we have extracted all our investment out of all properties except for our last purchase.  

Not quite, because your downpayment is not compounding, it's still 20k even after years.That is the reason why it makes sense to extract equity via a refi and buy another asset.So in conclusion, yes, principal pay down alone is pretty good.

Even if you only extracted 10% LTV on each that woudl give you enough cash to buy 2 more properties. 

I want to extract the equity I have to increase the IRR of the two properties and also use that equity to invest in other things (crypto, stocks, real estate, my business).Considerations: Starting a car rental business, also have an e-commerce business that does run into cash-flow problems sometimes (that's why I thought the HELOC would be a possible good option)What do you guys think would be the best way to leverage my equity?

The poor appraisal has an issue related to the negative position and that is ability to extract the ADU investment.  

THEN pitch to them and you will see how easy it is no matter what market you are in.Let me rephrase this...So what you all do is take a group of people, pitch to them, and extract the motivated sellers by collecting the people that went for the pitch, and called you back and showed interest.That is wrong.What I do is I isolate motivated sellers FIRST, and THEN I do my pitch and the results are obviously far better most of people her eon BP can only dream about!

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It is very unlikely that a refinance will allow anyone to extract the full hands off costs of a hands off ADU.Good luck

Under contract and reviewing the inspection report.Several things need to be completed prior to renting it out:PaintingCabinet refinishingKitchen floorDry wall extraction and repair - after water damage Breaker box - new breakerNew sink fixtures and adding disposal to itSome minor electrical repair - gfci Between now and final closing, what should I be doing to line up contractors to fix things and minimize the time between taking possession of the property and renting it out?