Architects who practice in dense cities know its almost impossible to add square footage to an apartment. Yet at a garden-level residence in Boston's historic Beacon Hill neighborhood, Chris Greenawalt of Bunker Workshop was able to unearth 70 square feet of living space through a little excavation. Photo 1 of 5 in Beacon Hill by Luke Hopping

Beacon Hill

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Architects who practice in dense cities know its almost impossible to add square footage to an apartment. Yet at a garden-level residence in Boston's historic Beacon Hill neighborhood, Chris Greenawalt of Bunker Workshop was able to unearth 70 square feet of living space through a little excavation.