Estimate gut rehab cost in Boston area

[Matt Donker]

I an considering buying a 3 floor 3600 sqft property in the Boston area. It will need a gut rehab. I aim to convert it to condos (property has 3 units). While doing my bottom up cost estimate, I would like to do a sense check of my estimates. I am looking to the forum to get feedback on any ballpark estimate for a gut rehab of this size. Any feedback would be greatly appreciated!