Additionally the legal doctrine of merger combined with "upzoning" promotes mega-blocks.
In MA, under the merger doctrine, adjacent nonconforming lots generally merge for zoning purposes when they come into common ownership. This holds unless a municipality adopts a zoning ordinance/bylaw overriding the common-law doctrine of merger, allowing adjacent nonconforming lots coming into common ownership to be treated as separate lots for zoning purposes. As such, if adjacent non-conforming lots are purchased within a rezoned area, that resulting lot effectively loses whatever pre-existing non-conforming (PENC or "grandfathered") status the previous lots had.
The impact of this is that, in an area that has been "upzoned", a merged lot cannot be subdivided in a manner that would violate the new zoning, even if it would result in smaller/better development that would have been allowed under the previous zoning.
I'm not sure if that's what happened in this area, but it certainly wouldn't surprise me,
In MA, under the merger doctrine, adjacent nonconforming lots generally merge for zoning purposes when they come into common ownership. This holds unless a municipality adopts a zoning ordinance/bylaw overriding the common-law doctrine of merger, allowing adjacent nonconforming lots coming into common ownership to be treated as separate lots for zoning purposes. As such, if adjacent non-conforming lots are purchased within a rezoned area, that resulting lot effectively loses whatever pre-existing non-conforming (PENC or "grandfathered") status the previous lots had.
The impact of this is that, in an area that has been "upzoned", a merged lot cannot be subdivided in a manner that would violate the new zoning, even if it would result in smaller/better development that would have been allowed under the previous zoning.
I'm not sure if that's what happened in this area, but it certainly wouldn't surprise me,