come on Somerville, don't give this site away.
You're totally right that, for what the developer is getting, this feels like a $1 sale. But given the fact the building was generating $0 in property taxes and has been a neighborhood blight since the school closed, I think this is shrewd dealmaking by both parties. Developer gets a massive lot for very little, but creates a marquee new building, new open spaces, and has 15 of the 40 units priced at below-market rates.
City gets little on the sale, but now has new tax revenue and a big boost to one of its least noticed neighborhoods.