Although these drawings look clean, I still think we lose architectural heritage by gutting old townhouses. Clearly, the whole needs to be protected so interior space, cornices, woodwork, moulding, grills, hearths/fireplaces, cabinetry, waterworks, doors and doorways are preserved and restored. The outside shell is nice, agreed, but the heart of a building is undervalued. Unfortunately, destroying the inside just becomes another cost savings for developers.
The second issue I find puzzling is why developers are allowed to build beyond scale, especially considering the plethora of vacant lots or decrepit buildings throughout the city. Building ugly towers behind 3 floor row houses changes the character of the street. Developers leverage street character and location for their gain; once sold, we are all left with their byproduct.