If you pay cash, you don't have a payment, but effectively you are giving up an income stream if the cash had been in a bond or ETF and earning you either interest or appreciation. 

Any transaction done with little or no equity contribution is most probably (there may be a few exceptions) in danger of “blowing up” from over leverage and insufficient equity cushion.  

I've had business and conducted hundreds of sales transactions and find it very underhanded.

I do see many investors incorporating a similar strategy with new construction builds, heavy rehabs, or in instances where the property was bought far below market value (usually a wholesale type transaction).

I would love to hear about your strategies of which you all used to effectively scale.

On the other end of the spectrum you have those teaching others how to syndicate larger transactions.

By insurability I'm referring to the problem created for title insurers evaluating what has transpired and whether they will issue a policy on the next transaction.

I want to make sure they can close these types of transactions and are used to working with real estate investors...

@Sebastian NadalI've used Zillow Rental Manager to screen my tenants and have found it effective.

The analysis also reports that new multifamily development will “remain near the average recorded over the past five years”.Integra Realty Resources’ 2017 Commercial Real Estate Trends Report ranks Pittsburgh #2 on its Top Markets by Multifamily Transaction Volume Based on YoY Change.Pittsburgh’s rental vacancy rate has declined by 25% over the last five years.Pittsburgh is booming with developments (see reference #6), “there is no better place to be a developer right now than in Pittsburgh.