I imagine the exchange building is probably safe, pending the fiscal state of Lesley itself - the bonus height for retaining historic buildings would come in very handy.The architecture of the porter exchange building is pretty cool and definitely worth saving in my opinion and cafe mami has the best japanese curry in massachusetts imo. It would be cool if they could do an adaptive reuse of the building landmark center style, and then add a large residential building behind it in the parking lot. Then add some ground floor retail back and hopefully the same restaurants. Those empty lots directly across the street should obviously be developed as well, its nuts that they havent yet.
Lesley sold the lots across the street in November to Just A Start, the affordable housing folks behind the under construction development at 52 New St and the new Rindge low-rise building, amongst others. I imagine their pipeline is a little full at the moment, but they're planned for 15 stories as part of Cambridge Affordable Housing Overlay zoning, not even including this latest zoning effort.