The state website can also be very informative. 

I can accurately estimate utility costs as most util companies have estimated usages and amounts on their websites, but costs like maintenance, CapEx, make ready, etc., are much harder to estimate.

You can look on websites like https://www.corporatehousingbyowner.com/search/United-States... and https://www.furnishedfinder.com to see what similar houses are rented for.

Spent a minute on their website and this in particular stood out to me as a red flag.

@Henry Perez  Things like websites, bios and marketing materials help on credibility as well as your LinkedIn and Facebook profiles. 

Another way is to check out this website.

I'm new to this website and excited to learn from all of you!

She was very pleasant and explained that their website doesn’t work, which we thought was a bit unusual.

If you go to the property appraiser's website, you can probably  look at the year over year change in the taxable value of the property.  

I was just on their website looking at the permit process:CityofSac-STR PermitLooks like 90 days max until you get a conditional use permit but still reading as it seems a little unclear:A short-term vacation rental may operate from a location that is not the operator's primary residence for a total of 90 days in a calendar year.