Any improvements you make need to have a comp available to compare it against. 

I heard on the BP podcast that Pro members have access to free document templates for landlords specific to each state.

So, since it starts with “rising unemployment” I assume the author doesn’t own a computer or can’t afford internet access.

It's parking and access is too. 

All of these things will greatly improve your chances of success.

Short term Loan ARV would be my suggestion you could get up to 90% of the Costs covered then refi out once the work is done in a year...but make sure to improve your credit in the meantime 

The unit is on the roof with no access except by ladder.

-I can always improve my performance in various areas: marketing, sales, etc.

Most builders are only able to make a profit because they build many homes at once and get materials at a steep discount due to the quantities they order.It's not like flipping, where the property is there are you are just improving it, you will have many costs such as connecting the property to the local utilities which could be inexpensive but can also be (more likely) crazy expensive, it all depends on the land you purchase and the proximity to current local utilities.The lure to jump in can be hard to resist, but take your time and find the right property. 

When those are compiled, I also look at the quality of the finishes/interior to match with my target completed improvements.