Gut Renovation of 1400 Apartment

My offer for a 1400 apartment was accepted. I had a contractor that my broker recommended do a walkthrough. He gave me an estimate which includes demolition, floors, electrical, adding a new bathroom, renovating powder room, renovation of existing bathroom, kitchen and adding a wall to a large room to split it into two rooms. His estimate was about 150-200k (so let's say 200k). That's just the raw materials and does not include fixtures or appliances. That said. Is that a realistic quote? I don't want to sign the contract to buy until I have a good estimate. I understand there will be other costs . So I'm hoping I can get a rough idea from anyone that's been there done that. Thank you all!