I tried fertilizing it with muriatic acid, even cut the roots so it could absorb the fertilizer better.

A WA/OR lawyer, Darrin Class, has provided these helpful (for me) summaries of WA law on matters of trees, roots, branches and "Spite Fences" (like painting trees blue). 

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. - Outdated aluminum wiring and 15+ ungrounded outlets.I’m thinking that I will have them pay for mold remediation and vapor barrier installation (assuming that is the root cause of the moisture).

If so, roots may be intruding into the line and this issue may return in the future. 

It's completely free to you and will root out a lot of the scammers.

In this case the calculations appear fine, but the numbers used in those calculations are too aggressive.Cap ex/maintenance should not be a percentage of rent as it is not primarily a function of the rent but the features (bathrooms, detached vs attached, root type, foundation type, yard, hardscape, etc.). 

We're all rooting for you.

What conditions cause empty lots to go up in value and what should I root for?

If you have roots in the tank your capacity will be reduced.