And, when you see your next tax bill, your heart will stop.

I then would have my tax cpa enter in or do it after discussing tax based items (depreciation- MACRS, reserves, year end accruals, reserves, etc.).

If the signs point to selling, consult your CPA about the tax implications.

The California government will deal with the damage the same way all governments do , they will find a way to raise taxes or get the Feds to pay for it ( that will be difficult with the new administration ) Here is what I find ironic , California has C.A.R.B. to pass regulations on vehicle emissions .

Finally, short-term rentals can offer potential tax advantages, as many expenses associated with the property may be deductible.

I have 2 options:- finance the construction pre-selling the apt, and take my profits (expected to be around 700K pre-tax); or- finance the construction with a 6-7%/year loan (collateral = my house), keep the 10 units, and once the building is completed in 24 months, rent them for circa 180K/ year gross.

PropStream was good with property, title, and tax data.

@Andrey ShostakA tax calculator would be nice.

Not to mention the tax benefits it allows. 

Mello Roos are bonds that are floated to do off and on site development and then added to the tax bill. there is also 1915 act bonds etc.. if there was not the ability to float bonds CA would never have developed as it has as the up front captial for major improvements would have been a major stumbling block..