For Felix Claus, a 1930s rental apartment is more than an idyllic pied-à-terre—it’s an architectural gem that requires reverence and careful tending.  Photo 5 of 7 in Luxurious Bathrooms by Diana Budds

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For Felix Claus, a 1930s rental apartment is more than an idyllic pied-à-terre—it’s an architectural gem that requires reverence and careful tending.