If there are vacancies how does one typically find tenants for industrial space like this, just list it with a commercial agent and let them do their thing?

Newby investor doesn’t factor in maintenance, capex, turn over costs, vacancy costs the same as another investor.  

Higher risk properties have more variable costs, vacancy, CapEx, maintenance, and potential evictions. 

What is your vacancy rate percentage when calculating monthly income?

I’ve looked on affordable housing.com and have noticed a lot of vacancies. 

That would give you more rent coming in per 'house' and also help protect against vacancies (ie one unit might be vacant, but you still have rent from the other unit coming in). 

Also, don’t forget some brokerage fees when you find another renter, so account for at least some vacancy and fees once every 18 months. 

I seek out tenants who will stay a long time, reducing vacancy, and turnover costs. 

You have every right to that information, they live on your property, PM'S come and go, you may even switch PM's like i just did, so that information is not just for the co. that filled the vacancy, the information is there for you should you have to go after the tenant, no matter who manages it.

The COC will be right around 8%, with $500 in cash flow (after accounting for Maintenace, repairs, taxes, insurance, vacancy, etc.).