The zoning office suggests reviewing the zoning ordinance, but the course didn’t cover zoning assumptions in detail.What’s the best way to verify zoning suitability and double-check zoning information?

I'll check them out for sure. 

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I currently have 7 rentals units ( two three unit properties, an investment condo and a garage space) Currently I accept many forms of payment including Zelle, Venmo and paper checks.

A nice portfolio is 10-40 properties, and yes you should drive by your own assets to check for broken windows.

I would definitely check Dunn and Bradstreet for any open lines of credit, liens, judgements and the like. 

Quote from @Sherry McQuage: Make sure to check the zoning to make sure mobile homes are permitted there; check for any hazardous waste designation for the area; will you need to have the parcels surveyed out in order to sell the size you intend? 

What you want to check when signing up a PM is their indemnificaiton clause on who covers who in case someone does something wrong. 

Check if you can take a 401k loan if you want to pay interest back to yourself instead of a bank, too. 

Yep check BP and Meetup.com or Eventbrite for local meetups @Baron Wheeler