I’ll add Somerville did a study when prepping for assembly square that’s briefly referenced in the neighborhood plan for assembly and it found that increased density offsets the cost of new housing, if you’re on a town planning thing maybe you could reach out to the city government for the full methodology and results of that study

http://www.somervillebydesign.com/wp-content/uploads/2022/06/ASN_Plan-Update_Final.pdf