Jeffrey:I'm connected to a large group in Indy that focuses on buy & hold SF and apartment (commercial) residential real estate. 

The information contained in this post is not to be relied upon.

Most contractors here in California will charge their hourly rate and possibly ad on a smaller charge if they need an assistant.  

In southern CA, even garage conversion ADU additions are typically costing more than the value added.  

Can’t house hack, we own a large home with lots of kids.

Large syndication company, higher fees than most other syndicators.

There are some very aggressive investors that refi into interest only products to free up even more cash in the short term - this can be much more risky though, so not recommended if you are not very experienced and have large reserves.

In general in single family zoned areas, JADU typically subtract value (I suspect largely due to the OO requirement).

Otherwise it is UNPERMITTED taking a note by the appraiser as added on W/o a permit.

Nate @Nate Marroquin   You can use the income from your tax returns on the current rental adding back your paper loss (depreciation) and add back the mortgage interest, property taxes, home owners insurance deductions on your tax returns.