I have a property that generates a 20% CoC currently that I bought 2 years ago.

What else is multiple streams of income, opportunity to build a team and generate income from the sales of your team members, the opportunity to sell the properties you don't want to flip yourself to someone else who might. 

I want to generate a list of off market multi family properties.

Other than that, your best bet is to get in touch with some wholesalers or start generating your own off-market leads. 

Better to have deep knowledge of an area than quick glances at tons of random properties.

What marketing strategies are you using during the pandemic to generate leads?  

I've been evaluating similar options and when you take into account all the wealth generators (Cashflow, Appreciation, Debt Paydown, Tax advantages) the 5% down has come out with a higher overall return in the scenarios I am looking at.

I enjoy seeing the enthusiasm of the next generation and if I can give them a little bit of hope & direction in how they can change their future and can learn to invest and can learn to help others, I call that a good use of my time.   

Once refinanced it is estimated that the new mortgage will be $5,000/month.Is it worth it to cash-out refinance at 75% to start investing in other properties to generate cash flow properties?

This will allow the building to still generate revenue while you methodically get everything up to market.