The blue heaven stone from Belgium and the marble from the 18th century is impressive enough at the newly listed Unit 5 in 257 Commonwealth Avenue. So is the terrace and the two back-to-back garaged parking paces. Ditto the two-story, sky-lighted foyer in the penthouse duplex. But what really might do it for you is the architectural pedigree of the building: It was designed in the 1890s by famed firm McKim Mead & White, which was divining the main branch of the Boston Public Library around the same time. The 3-BR, 3-BA, 3,136-square-foot condo is asking a mere $4,585,000, which barely places in amongst Boston's priciest listings overall. Still.
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