Say property owned by “property company” gets purchased by “business LLC” for the new value, which would be a new depreciation amount about 3x higher When refinancing a commercial building that is being rented out, the valuation will typically be based on the Net Operating Income (NOI) of the property.

We are coming to the new era where company that sells virtual reality , virtual real estate and AI like Nvidia , Meta or Microsoft ; and also "virtual" coin like Crypto is valued way way higher than real actual tangible real-estate like office building , apartment building and so on and so on for example the level of valuation for office building is like a wipe out.If the investment climate continue like this where there's no relevancy between investment and tangible or the real word , how conservative real estate investor like us should react ?

I know it is typically only used for finding vendors when you have an issue but I bet the right handyman would be open to your proactive search.

Underestimating costs, excessive leverage, neglecting to perform due diligence, and unforeseen repairs or vacancies are typical problems.

This is another example of why I advocate for tax planning not just transactional compliance work.  

Typically the actual max rent is $200-300 less than what is published there.  

Just today for example, I found a 4-plex (very rare in my area), so I ran it through PS.

typically a BRRRR property is so distressed that it's not possible to purchase with conventional financing - so the usual options are actual cash from your own checking account (if you have it), or private money or hard money. 

Under the Tax Cuts and Jobs Act of 2017, interest on such loans is typically deductible if used for buying, building, or substantially improving the taxpayer's home that secures the loan.

Then they continue to just flat rate charge us a fee for the water which for a typical residence 3/2 house is about $1400 per year for all the water you can use.