In my market I have found there are under performing apartment buildings between 10-20units that have potential to increase rents and cash flow.

I'd happily accept the former, though the 16% YOY property tax increase would be a non-starter for me.

I can mark it up with a fee or by increasing the rate (or both, but I never do).

Our auto coverage is now at an increased level so if this happened today it likely would not result in any involvement of the umbrella policy. 

What is great about teak is wild teak is drastically diminishing while the demand is increasing.

Overall nationwide cap rates are rising because of interest rate increases.

Quote from @Lionel Quiambao:  ... and maybe throw in the option for the tenant for more speed at an increased rent to cover the additional payment. 

Is there a way to increase the cash flow from those?

The closer you are to Huntsville the rental demands increase.

I've already renovated one of the bathrooms, and I’m planning to paint the interior, update the kitchen cabinets, possibly sand the wood floors, build a fence is a corner lot and increase the rent for the room since my tenant is currently renting the entire 3-bedroom, 2-bathroom house for $800 a month.