Perform the same task in each app to ensure a fair comparison.Load a property with pictures and details.Market that property.See what your marketing looks like from the public's perspective.Submit a fake application to see how easy the process is.Run a credit/screening report on yourself.Enter a maintenance request, assign a vendor, and attach a fake invoice.Enter charges to the tenant's ledger.Enter recurring charges and automatic late fees.Sign documents electronically.Run owner reports.After testing a few apps, one should clearly stand out.

Frivolous stuff where plaintiffs were looking to get onto some sort of public assistance forever based on a fall or a stumble where one should not have fallen or stumbled.

Hire a public adjuster.

Some buyers (think Cary NC in the 1990s) are looking for attributes not related to economic value, like: common areas, access to public transportation, proximity to parks, etc.

@Collin Brown, IRS Publication 523 addresses this quite nicely - Vacant land next to home. 

It sounds expensive, but perhaps the property falls under certain requirements, including interconnecting the detectors.Maybe this can shine some light:https://wbcapp.oaklandnet.com/cs/groups/public/documents/translateddocument/b3dk/mdaz/~edisp/dowd003911.pdf

Whether a property is listed publicly or privately doesn't automatically make it a bad/good deal, it just affects the visibility of the deal and more importantly: how motivated the seller is. 

Property tax is public record, you can look up a neighbor's property.Ask a neighbor about their utility costs.Call an insurance broker and get a quote based on your build specs.

IRS Publication 537 outlines installment sales (seller financing), which, depending on the seller's individual circumstances, can defer and sometimes reduce the amount of capital gain tax owed. 

It is not for use for the general public.