Converted duplex no permits
I just bought a duplex in land contract with no money down as a buy and hold. Just found out that the conversion was done without any permits. The electrical and hvac were not separated. The previous owner included utilities in the rent to account for this.The conversion was done over 20 years ago. It has been rented and used as a duplex for the whole time. It has great cash flow! Should I keep it this way it is or should I try to make this a legit duplex?