This is also accounting for my increase in insurance costs due to adding insurance to the ADU. 

If you have an LLC, the accounts should be business accounts in the name of the LLC.

My guess is that you will pay less per month with multifamily than a single family. 7.

Quote from @Jacob Dalton: I purchased a single family home good quality location in Chicago’s Northwest Suburbs in Cook County as a personal residence.

We have a single HVAC system that heats/cools the entire home.

In this manual (which I assume could be modified to provide to tenants) I include all the financing information (which you would not include for tenants) bank accounts, mortgage accounts, payment information, and mortgage payoff), a list of the contractors, what each contractor does, a list of upcoming planned or necessary repairs, and a copy of all leases associated with the property.

I have 8 single family rentals in 2 single member/pass through entity LLC's. 2 states.

We also have a bank account at a smaller Chicago community bank, but there technology isn't as good to be honest.I think @Jonathan Greene's main point is don't step over dollars to pick up pennies. 

As always with accountants, it depends. 

Do you think a duplex is generally a better investment than a single-family home for rental purposes?