To build a new facility will now cost at least $750 million, a design firm estimated, up from the $600 million projected two years ago. That’s with an aggressive timeline and if state officials were to greenlight it immediately. A 2024 presentation shows the difference between the kitchen facilities at the recently built women’s prison and the aging men’s prison. A 2024 presentation shows the difference between housing units at the recently built women’s prison and the aging men’s prison. It’s planned for a spot directly behind the women’s prison, which is right behind the current men’s prison on North State Street.