How long and how much will a gut renovation cost.

By on August 28th, 2010

I have a house that was built in the 1950’s and added onto some time after that. It is in bad condition due to previous owners neglect and mismanagement. I intend to have the house gutted and renovated with several changes in floor plan. I intend to have several walls knocked down and relocated, two stair cases widened, a kitchen redesigned, and the three bathrooms altered (two increased in size by use of rooms we intend to get rid of and one relocated in the basement). The whole house is about 3000 square feet including basement, first and second floors, and I was curious if anyone had any estimates on how much this would cost and how long it would take.
I live in the USA, I plan to do no labor since I will have to look after my kids in a rented home while renovations are going on. And I am looking for just the cost of renovations not including house rental and storage rental and all that.