My wife, daughter, and I live upstairs, and we found a fantastic couple to rent downstairs.My wife was not into this idea at first, and I had to make several charts in Excel to demonstrate to her how advantageous buying an owner-occupied duplex is.What convinced her were the following images.

David, you brought up some excellent points. 

Hi Justin, I may be a little biased because I live in Brevard County, but I think the Cocoa Beach / Cape Canaveral area is excellent for vacation rentals.

Thomas,That is excellent.

He does excellent work and is very responsive.

You can try reaching out to @Brian Schmelzlen who is an excellent choice in San Diego, though you may find CPAs a bit busy at the moment with the upcoming 9/15 and 10/15 tax deadlines.

I have an excellent referral for you.

I use excell and have over a dozen properties.

I only have one duplex with them and feel the attention they gave addressing my concerns was excellent, which I really appreciated. 

As an additional bonus, there are self-directed IRAs and Solo 401k plans that allow these excellent tax advantages AND the ability to invest into real estate for potentially higher, more stable returns than typical IRAs and 401ks locked into the stock market.