Help me analyze Deal

[Account Closed]

Found a owner selling a 2 family, The asking price is 55k and the yearly taxes are 2500. The 2nd floor is rented out at 625, the first floor is vacant but could get 650-675 2 bedroom but has a den. All the rehab is done

I have 25% to put down so

14k down
potential rent income 1250 x 12 = 15000
Yearly taxes 2500
Insurance= ?
vacancy = figure one month of both units being vacant.( area looks good not a war zone but in a city)

Monthly
finance of 41k over 30 years at 5% about 250?
taxes=210
Insurance=?

This would qualify the 50% rule