My answer would certainly be highly dependent on his own emotional make up, his desire to relax and travel, his willingness to delegate and outsource, etc.

Hi @Jerry Nogueras that depends on your goals and how open minded you are to different strategies. 

Most HMLs, depending on your and your partner's credit score and experience, only require 15%-20% equity/down payment from borrowers.

You can get a HELOC if there is equity in the property most likely, which there should be since you own it in cash, but you will just be decreasing your pay out and then may end up short in repair money, depending on how much it is worth.

Depending on how that conversation goes, post a 3 day for nonpayment. 

Selling would likely mean taking on new loans at much higher rates, reducing your cash flow margin unless the new properties are stellar performers.Transaction Costs and Taxes: Selling could trigger capital gains taxes (depending on exemptions) and other selling costs, eating into your net proceeds.

It all depends on your location and service.

This all depends on what you buy, and more important, how you buy it,...and I'm not saying put more money down. 

That being said, this depends on your overall financial situation.

@ Sanjay BakshiHonestly it would depend on the demographics of your rentals.