I know there are companies that give HELOCs based off the future appraised value of the home.

However, since the value of a commercial property is almost solely based on the income of the property, investors and bankers alike have grown to love balloon payments and rate resets.

Absolutely fair points and fair assessment of both Nimby's and Yimby's typically based on how they will be PERSONALLY affected. 

Does anyone have good experience with cold callers and where they're based out of?

My realtor commissions get paid to my LLC which is an S-Corp so I pay myself a salary based on the total of the realtor fees and other flips I do throughout the year.

The mechanics of the deal are not too complicated, although as others have noted you can't advertise the property and then exclude people based on protected class including gender and family status....at least not legally. 

Based on my experience with hoarders - Leave it alone.Unless they are causing damage you really don't want to spend your energy chasing that.

Lvp is a very easy diy install...another reason for fan base.

Here are some recommendations based on the limited information you posted:Yes, I would get the chimney flue installed.

Like anything, AirDNA is just a tool and will give you one data point, I wouldn't base your go / no-go decision based on AirDNA.