I'm sure the wealth managers on this thread will have a thing or two to say about it, but the data is pretty clear.  

The access is nice, yes, but 80-90% of the data is out there already.

If it will rent for $300 a night for 20 nights a month ($6000) then there is your answer.......Here is a screenshot of the Airdna data.

Reality:  not so much.For lead generation BP has been my only source that has worked, but most of those leads only ever want to look at MFH, and I've learned the hard way MFH data is sucky beyond repair in the MLS.No closings. 

Also, I am exploring flips or Brrrr to increase my capital so I can syndicate MF. 

With condo investing, you don't really need an amazing investor-friendly agent to do the data, you just want someone who can run rental comps in the same complex so you know what your expected rents will be against the HOA and taxes and payments.

As a credit bureau, TransUnion offers some of the most comprehensive data to managers at a competitive price.

With these three data points, you can arrive at the expected value of the property. 

If there is another way, we are open to exploring it.

This is usually a 2-step process. 1. pull a list of people likely to want to sell their home. 2. append phones and email to that list where available.You can work with a list broker to walk you through and make recommendations for your target.Please note that "loan balance" is not public data and the only sources that do have it are credit score companies and there are a lot of legal restriction around selling the data.