I do not know if Boston is unique in this regard, but there was a lot of company housing in the region.
Where I worked in Longwood (Boston), the offices surrounding me were massive, historic buildings with plaques commemorating their origin. They were originally built for housing nurses and doctors who worked in the area's hospitals (there is a concentration of hospitals in Longwood).
So in this case, these were built and used as housing before a later conversion to office space.
These are currently utilized hospital buildings. IMO, they are unlikely to be converted back to residential at this time.
Where I worked in Longwood (Boston), the offices surrounding me were massive, historic buildings with plaques commemorating their origin. They were originally built for housing nurses and doctors who worked in the area's hospitals (there is a concentration of hospitals in Longwood).
So in this case, these were built and used as housing before a later conversion to office space.
These are currently utilized hospital buildings. IMO, they are unlikely to be converted back to residential at this time.