Should I finance or pay cash on a duplex

[Zac Boelkow]

I am buying a duplex. I am in contract presently. My question is should I pay cash or finance... Purchase price is $147,500. I am assuming interest rates are around 4% in todays market and if I finance I would put 20% down. The duplex is already rented with two long term tenants paying $1400.00 combined per month. I feel like paying cash returns a much greater cash return per month than obviously financing would. If I finance the property I can still net aprox $400 per month on a 30 year term. The math on a 15 year term will only net roughly $150 per month. Typically I pay everything off as I am not interested in working for the banks. I am completely debt free and the money to buy this duplex would be 75% of my liquid net worth. Real estate is my passive income as I work a 9-5 that produces me more than enough money to live on... Any help, tips, suggestions, and or advice will be appreciated.