With a rate for a first mortgage today in the 6-7% range something like this probably is going to be close to or in the double digits. 

If someone does the work to generate a meaningful question, I wish there was more respect given to those folks. 

Quote from @Min Zhang: Hey Alan, I have seen areas like Cleveland and Dayton with COC ranging from 10-18% and Columbus is around 8-12% with strong growth. 

I am covering utilities for the 1st floor and garden unit (for a 3-unit MFH rental)Any recommendations for a programmable thermostat where I can lock appropriate temperature ranges?

You are free to run your business however you see fit, as long as you are respectful to your property manager and not bugging them about every little thingYou are the CEO, the pilot of the plane, the head chef, the one in charge.

As mentioned above your new rate should actually be 6-7 range not 8s so shop around.

I've had success with 2 short-term rentals, and wanted one more in relative close range to work and life.

Google search gives me these super wide ranges and mostly talking about adding a bedroom in a SFH, which I'm not sure if applicable to this situation of "moving/subtracting a bedroom from one unit and add it to another unit in a duplex". 

First off, respect for taking action, brother.

Investing in multifamily properties in Philadelphia is popular due to the city's steady population growth, job opportunities, relatively affordable property values, and solid rental demandPhiladelphia’s multifamily market offers a range of opportunities, from high-end neighborhoods to up-and-coming areas with great cash flow potential.