Also $10k in savings bank cash. 

My goal is to create an enterprise that spans real estate and business able to support and grow my team and better my community.

If you are looking for a 100% risk-less & predictable place to park your money I'd suggest a CD at your local bank.

100% financing is tough...even for private lenders, unless there are compensating factors (great track record, proven successes, strong reserves, great credit score...maybe even good job/w2 income (usually not a factor for non-bank investment property lenders, but may be for a private individual)). 

Is there certain criteria for portfolio loans and are they mostly acquired through local banks?

etc..You can try to go conventional, to a community bank/portfolio lender, or to a non-bank lender for the above. 

We ending up putting 25% down on a commercial loan with a local bank.

Is there any typical reasons why the bank as not listed them for sale?

I'm looking to borrow $50k for the down payment and plan on financing the rest with my local bank.

You can also go the community bank route a look for a portfolio loan, which will give you flexibility to expand/borrow on more properties.