How do I estimate rehab on this property?

[Heather Schmidtknecht]

I am looking at a BIG 4-plex that has been neglected for a while but is currently rented. Here are the numbers: * 3844 square feet, 2-story, 4-plex buIlt In 1882 * Rents for all 4 units total $2930/month * Landlord pays heat (gas boiler) and electrIc whIch Is $350/month total * Landlord pays water/sewer/trash whIch Is $170/month total * Taxes are $3k/year Needs: *ExterIor & InterIor paIntIng *Roof *FloorIng throughout *39 BIG wIndows *Most applIances are quIte old LIstIng PrIce: $199K (motIvated seller)