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There is a reason they called upper Fifth Avenue 'Millionaire's Row.' For roughly fifty years, walking it meant passing an almost unbroken row of private chateaux, Vanderbilt after Astor after Clark, each grander than the last, with not a store or office in sight. Today the same stretch is a corridor of towers, shops, and hotels. The before-and-after is one of the most dramatic in any American city.
The 'then' is almost impossible to imagine standing there now. Picture a canyon of carved limestone and brownstone mansions, marble porte-cocheres, iron gates, mansard roofs, and turrets, where the wealthiest families in the country lived side by side in palaces modeled on the chateaux of France. Carriages lined the curbs. Liveried servants came and went. For a few decades, this was the densest concentration of private wealth ever assembled in American architecture.
The 'now' is a different city entirely. That same stretch of Fifth Avenue is lined with office towers, luxury flagship stores, apartment buildings, and hotels. The private mansions are almost all gone, replaced one by one across the 1920s and the decades that followed. A handful of survivors remain further uptown, the Carnegie and Frick houses among them, but the continuous wall of palaces has vanished.
What makes this the ultimate then-and-now is the sheer scale of the change. This is not the story of a single lost building but of an entire lost streetscape. Block after block of private chateaux, gone within a generation, replaced by the commercial architecture of the modern city. The transformation was so complete that a visitor today would never guess what the avenue once looked like.
The cause was the same force that doomed each individual mansion: land value. As Manhattan's commercial core pushed northward, the lots along Fifth Avenue became some of the most valuable on earth, far too valuable for private houses. One family after another sold, the wreckers moved in, and the palaces came down to make way for buildings that could earn their keep.
Set an old panoramic photograph of Millionaire's Row beside a present-day street view, and the effect is genuinely disorienting. People struggle to accept that it is the same street. The proportions, the textures, the very feel of the avenue have changed so completely that the two images seem to show different places entirely. And yet they are the same blocks, separated only by time.
This is why the streetscape then-and-now is so much more powerful than any single before-and-after. A lost building is a tragedy you can grasp. A lost streetscape is something larger and harder to hold in the mind, an entire vanished world, a way of living and building that simply ceased to exist within the span of a few decades.
It also helps explain why the lost mansions feel so haunting. They were not scattered oddities. They were part of a coherent whole, a single magnificent street that represented the peak of Gilded Age ambition. When that street was dismantled, it was not just individual houses that were lost but the collective statement they had made together.
Standing on Fifth Avenue today, among the storefronts and the office lobbies, it takes real effort to summon the old image. But it is worth the effort. Close your eyes and replace the glass and the signage with limestone and iron, the towers with turrets, the shoppers with carriages, and for a moment the canyon of palaces returns, the way it looked when this was the grandest residential street in America.
That is the gift and the melancholy of the then-and-now. The same view, a century apart, shows you not just a changed street but a changed civilization. Millionaire's Row is gone, swept away block by block, and only in the pairing of old photograph and modern street can you still glimpse the wall of private chateaux that once lined this most famous of avenues.
It is no accident that we reach for photographs to tell this story. Words can describe a wall of chateaux, but only the old images can make you truly believe such a street existed, and only by setting them beside a modern view can you measure the distance the avenue has traveled. The camera is the one reliable bridge back to the lost street, the proof that the canyon of palaces was real and not merely a legend.
