However, most of these data sources, at that granular of a level, are not free. 

If you have multiple properties, you can create a bank sub-account for each property (assuming there's a separate statement for each property) for more granularity.

You can get very granular... just depends on what you want.

This data comes from the American Community Survey and is tabulated at the block group level, which is more granular than zillows neighborhood aggregate. 

The modeling side of things has really been the driving force behind some early successes we've experienced, and we want to make sure that we're able to leverage our financial results to refine the accuracy of our modeling as we grow and learn.Given our professional backgrounds, we care A LOT about the quality of our expense reporting; however, we are not accountants, and we've been struggling to determine what level of granularity we need to capture through our chart of accounts.

Two investors come in for a commercial loan, all things equal except: one has detailed expenses to a granular degree, the other is less organized and did not claim some repairs, etc - is that latter committing fraud?

Not a dumb question, but it's so granular there are no accurate "ballpark numbers." 

But others can certainly be controlled with commercial products purchased at home or garden centers.This will be a bit lengthy, so bear with me.There are 2 types of spreaders in common use for granular products such as weed-n-feed: drop spreaders and rotary broadcast spreaders.

Same thing for my monthly cash flow analysis, which I do track, but not on a granular basis.

Even realtors try to manipulate comps and so I often will have to advise the realtor to make some adjustments to a comp if the properties utilized in the analysis, area or some other characteristic do not align with the subject.If you have the capability to capture the amount of real estate transactions such as Zillow does; not just in a particular city, state but at a country level, including granular details of those transactions, you have a right to make logical and defensible opinions about market place events and behavior.