The most sophisticated professionals always go through a transition from buying generic property lists to creating their own playbooks from raw data sources.

1) Air-DNA; either premium version or free trial.2) An Excel spreadsheet that contains all the raw data from Airbnb for all the listings within a city (just like if someone collected the data manually for each listing).3) Other software/app.Appreciate your thoughts on this!

However, most of the work involved involves searching for off-market raw land with development potential, finding the owner and seeing if they're willing to sell. 

If you are thinking of buying raw land, then you have the issue of running utilities to the property.

If there isn’t an appraisal report for your property, utilize one of the other methods discussed below.Comparable SalesIf an appraisal report is not available or feasible to obtain, you can analyze comparable sales on land that is raw and undeveloped in your location.

Even old wood windows can often be fixed with some sanding and paint.Single pane, raw aluminum is ugly and old wood frame is a pain to operate but they work well enough and not replacing them helps me keep my rents within reach for families who need affordable housing.In some cases I will replace a single window in a house if the frame is destroyed but I never do the whole house.

@Anx Carter - have you looked for comps on raw land sales near you? 

Miami is phenomenal and in my opinion one of the best you just should look at the ugly raw lands, etc. you have to buy ugly land to make a lot of money so it becomes more about land entitlement, wetlands removal, floodplain removal, etc to get lots to a buildable level.

Ft Bragg is top 3 of the DOD in terms of just raw personnel and unfortunately BiggerPockets has a hand in making the rents go up artificially there, but the strategy is still sane.

A century, or whatever, ago I would have loved to have bought up raw land between them for probably a couple $/acre.