Columbus is a great market to invest in!

Anything can happen: the market can shift, we can go into another extended lockout period, the property can be destroyed by a natural disaster or by vandalism, the list of contingencies is endless.

Are you in a market where the costs of the necessary capex is cost prohibitive?

Markets depict appreciation and rent growth into market price.  

But IMO, if you have to jump up double digits without a material change to the unit, you've screwed it up in the years prior.Staying on top of fair market rents is not easy for small landlords.

With e-bikes they are getting fair amount of use and in long term may be a good idea, but they do exasperate the parking problem.  

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

After I close I will still have 30k in immediate cash and I have stock market investments that are another 30k, so even more frustrating that it's not even a monetary issue

For flipping you have to be in a viable market that produces such opportunity. 

It's important to get to know the applicant before you just sign off after a fair credit/background check.