Establishing a City of Mke tax key

[Austin Siewert]

Quick questions - I’m looking at a duplex that is on a property with another duplex. Seller states that there is only one tax key thru the city of mke.  He seems to think is a relatively easy process for the city to establish a 2nd “tax key” for the second property.   Does anyone have any experience with this?       This is a new question for me. Thanks, rick