@Spud Davis first off want to say props for stretching your brain, you're heading in the right direction, just need to iron some things out. Echo most of what @Evan Kraljic said. Few things I'd add.
First, I assume here the building is not sub metered yet, otherwise utilities would already be separated. Pretty common around here for landlord to pay water/ garbage (unless you have like side by side duplex or town house style multi fam). Heat is a bit of a wild card, if you have 1 boiler/ furnace + 1 water heater you're stuck paying gas in your name. If you have 1 boiler/ furnace but multiple gas meters (maybe the stoves are sub metered, or you have multiple water heaters), then putting in 3 more boilers/ furnaces might be less expensive. You can aways create a RUBS system for utilities and bill back tenants for utilities after you get the bill, or just put a fixed amount (ex 75$/month gas) in their contract. Obviously gets complex. My point is just switching utilities to tenants is more complicated, and generally involves expensive sub metering.
Next, be aware that all 2br are not created equal. A super intuitive true 2br in a nice area would probably fetch 1300, whereas an improvised 2br with one room added on might get 1100-1200 on a good day.
Raising rent, assigning utilities involves ending old lease and starting new one, which can't be done during covid.
Unless you're in the absolutely most premiere area of Minneapolis I'd tend towards more cosmetic rehabs, instead of major wall moving, etc, as I just don't see the ROI in most situations... Of course I don't know your numbers and this may make sense for you.