If you've got water coming up through the floor or through a foundation wall, no amount of interior sealing will stop that.

We're probably looking at a new retaining wall, 4 french drains, new gutters, slicing up the driveway for drains, and all of the interior repair work.

Someone mentioned joining a mentorship program that offers a center of influence because it's appealing to banks and sellers.

I would recommend finding a 4-unit property that is ready to be rented but has a dated interior/exterior or as you put it, an "old property".

The calculators are not designed to provide Quantitative and Qualitative analytics on a property for the long-term.An example would be with the Rental Property calculator which allows you to maps out a 30 year chart, however it doesn't account for any rehab or interior upgrades that will take place over the 30 year hold period, yet the chart will tell you what your profits are at varying phases throughout that 30 year period. 

It needs carpet, paint, interior doors, and much more, including kitchen appliances. 

And this can influence where you buy.

The supply and demand in the mortgage market is a much more powerful short term influence on rates than what the Fed does.

Then maximize further by using opaque interior doors to reduce the feeling of being closed in.6.

This is what you are trying to gleam: useful nuggets of pertinent details that have a major influence on your decision.