Yes, I have been involved with several "mold" properties that still had high mold levels after remediation.  

Keeping our overhead low and estimated revenue high.

The other areas you mentioned are too high for this particular need

We pay $850 for a WH install, so, that seems high but you are in CA.

For active investments I advocate considering how you can diversify WITHOUT ceding your competitive advantage nor the superior profitability of the niche your in.As an example my business is running an investment fund and syndication high interest commercial mortgage loans secured by income producing real estate. 

It depends on your financial strength, the quality of the property, how many properties you own, etc.I like to start with one significant expense and three months of vacancy.

DSCR loans go up to 80% of the purchase price and depending on the Debt Service Coverage Ratio and your credit score you can expect rates on a 30 yr loan ranging from High 6%- Mid 8%. 

The issue is our land value is high, so the structure value is low compared to the overall property cost. 

Those remote flips and high cash flow rentals are so tempting on paper, but they rarely go well in reality. 

The neighborhood has been flourishing, making this incident highly unusual.What initially drew me to the property was the potential for high rent and strong cash flow.