I know you can look at various websites that will give you overall rental stats for a certain radius. 

No pocket listings = agents aren't even calling for new leads anymore, rising interest rate has nothing to do with an agent's ability to generate leads.If you mean multifamily apartments, 5 units and up, some of those agents will know, but not many until you are over 10 units which are more listed by only commercial brokers which I agree do understand seller finance.

Check out the website. 

House hacking lets you live in one unit and rent out the others, which can help cover your mortgage and generate some extra income.

The pay stubs can be hard copies or digital PDFs generated directly by your employer and sent via email; we cannot accept screen captures to verify income.Once your completed application materials have been received and it appears that you would meet our qualifying criteria, we would send you a link to perform a credit/criminal background check (this minor expense would be yours), and if those results come back acceptable, we would offer to proceed.

I think the HELOC is the way to go if you can - However after reading your post, if you are talking about a 6 figure pay day, how long would the property take to generate that 6 figures in cash flow?

I think.. that darn NMLS website is the most user unfriendly site I have ever seen..  

The ability to generate more income for simply the cost of a building is another huge cost saving over buying an expensive commercial lot and developing it.

Just like all aspects of life :) If you come across anyone needing help I created this website of free resources to share.

I usually print out the market rent provided by Zillow and a few other websites.