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After: The living room overlooks the great room below. Now when you walk in the house, you can see clear out to the trees in the back—an idea sparked by an interior designer friend who commented that the most important aspect of a design is what you see when you walk in the front door.

Sometimes all it takes is a little luck. For a young married couple, it came in the form of this rare find: a 19th-century, three-story, single-family home in the heart of Paris. The building was a charmer with good bones, but was in need of some serious care. In a vibrant retrofit by architect Pierre-Louis Gerlier that includes structural reinforcements, the reimagined design is set off with a new floor plan. The lower level now serves as a space for the couple’s children, with the public areas—including an open-plan living/dining room and kitchen—on the floor above. Upstairs, the attic has been transformed into a very large primary bedroom with a green-and-white bathroom suite. The living room (pictured) showcases the firm’s bespoke carpentry work with a beautiful, mossy-green built-in bookcase that frames a new fireplace, and a staircase surrounded by arched doorways that hold hidden storage. “We created visual breakthroughs in order to connect the different spaces,” says Gerlier. “The rounded arches are there to help magnify these moments.”

When architects Thomas Karsten and Alexandra Erhard toured the raw industrial space, they were struck by how much light streamed in, a gift bestowed by large windows and the rare presence of a private patio.