This is how it's done in Chicago - neighborhoods full of 2-to-4-flats with one set of interior stairs, a 1000-sqft-ish 2br unit on each floor, and a back stairc

This is how it's done in Chicago - neighborhoods full of 2-to-4-flats with one set of interior stairs, a 1000-sqft-ish 2br unit on each floor, and a back staircase / deck made of wood, where you can grill out and mingle with your neighbors. Good living