Intensive development of the neighborhood was the result of an 1845 change.
The soil of the Rensselaerwyck cemetery was particularly sandy and loose.
Since it sat on a slope above the streets, heavy rains would often wash away markers and expose the underlying coffins and remains.
By the early 1840s, there were many calls to move the bodies elsewhere.
One of the most vocal advocates for such a move, Joseph Hall, a gardener who lived on the section of Third now known as Ten Broeck Place, had Hall Street named for him when it was opened in 1849, four years after the cemetery was moved.

While the former burying ground site was made into a park instead of being built on, construction on other parcels increased.
The year the graves were moved, 41 Ten Broeck Street, the earliest dated house on that street after the mansion, was erected.
The brick rowhouses at 15–23 and 35–39 Ten Broeck followed.
In 1848, the neighborhood regained some of its original prestige when Thomas Worth Olcott, a prominent banker, bought the Ten Broeck Mansion and formally renamed it Arbor Hill.
He and his family expanded it over the next several years.
The King Building, an elaborate Greek Revival duplex, was built over four years in the 1850s at 27–29 North Swan in front of the archway that provided access to the mansion's grounds on the rear.

In the blocks to the west, newer clusters such as 53, 55 and 57 First Street joined the scattered houses that already existed.
At 23 and 25 Second Street, two brick houses were built in the late 1840s.
These show a common architectural transition for that era, with their basic Greek Revival forms being overlaid with Italianate and Gothic Revival ornament.

The Italianate style would become dominant in the 1850s, when a third of the hundred houses in the Ten Broeck Triangle, the eastern portion of the district, were built.
North Hawk and Hall streets were built almost completely during this period.
The rowhouses from 2–38 First Street went up between 1854 and 1862.

In 1855 St. Joseph's Church was built on Ten Broeck between First and Second to serve the growing Irish immigrant population, which generally did not live in the district but near it, close to their jobs along the riverfront.
It was designed by Brooklyn architect Patrick Keely, himself an Irish immigrant, who had previously designed the Cathedral of the Immaculate Conception on Eagle Street downtown.

By 1870, much of the district had been developed.
The lavish houses in particular that lined Ten Broeck Street gave it the nickname "Millionaire's Row."
Many had been built by lumber merchants and overlooked the Lumber District, the yards down by the canal and river where they did their business.
Another church, Sweet Pilgrim Baptist, was constructed in 1876 at the Clinton Avenue intersection, giving the district a distinctive southern gateway.
At the north corner, the polygonal home at 105 Ten Broeck featured an iron mansard roof, a hallmark of the contemporary Second Empire style.
Some of the existing houses, such as 8 Hall Place, also had mansard roofs added when they were expanded with third stories.

There was enough demand for housing in the Ten Broeck Triangle that a new street was added in the ensuing decade.
St. Joseph's Terrace was laid out in 1881 and formally subdivided for building ten years later.
The houses built there in the 1890s were similar in form to those that had been built in the previous decades, reflecting the area's continuing status as a desirable neighborhood, despite increasing competition from the newer Washington Park, completed in 1882, and the lack of service from the city's new streetcar network.
The neighborhood was home to Michael N. Nolan, an Irish immigrant who served as mayor and later, a member of the U.S. House of Representatives.

Architecturally, the new construction largely reflected contemporary trends.
There were still a few late Italianate structures like 96 North Swan Street, built in 1885.
But most new housing followed the Romanesque Revival of the late 19th century.
The brick rectory with stone trim built by S
Intensive development of the neighborhood was the result of an 1845 change. The soil of the Rensselaerwyck cemetery was particularly sandy and loose. Since it sat on a slope above the streets, heavy rains would often wash away markers and expose the underlying coffins and remains. By the early 1840s, there were many calls to move the bodies elsewhere. One of the most vocal advocates for such a move, Joseph Hall, a gardener who lived on the section of Third now known as Ten Broeck Place, had Hall Street named for him when it was opened in 1849, four years after the cemetery was moved.
While the former burying ground site was made into a park instead of being built on, construction on other parcels increased. The year the graves were moved, 41 Ten Broeck Street, the earliest dated house on that street after the mansion, was erected. The brick rowhouses at 15–23 and 35–39 Ten Broeck followed. In 1848, the neighborhood regained some of its original prestige when Thomas Worth Olcott, a prominent banker, bought the Ten Broeck Mansion and formally renamed it Arbor Hill. He and his family expanded it over the next several years. The King Building, an elaborate Greek Revival duplex, was built over four years in the 1850s at 27–29 North Swan in front of the archway that provided access to the mansion's grounds on the rear.
In the blocks to the west, newer clusters such as 53, 55 and 57 First Street joined the scattered houses that already existed. At 23 and 25 Second Street, two brick houses were built in the late 1840s. These show a common architectural transition for that era, with their basic Greek Revival forms being overlaid with Italianate and Gothic Revival ornament.
The Italianate style would become dominant in the 1850s, when a third of the hundred houses in the Ten Broeck Triangle, the eastern portion of the district, were built. North Hawk and Hall streets were built almost completely during this period. The rowhouses from 2–38 First Street went up between 1854 and 1862.
In 1855 St. Joseph's Church was built on Ten Broeck between First and Second to serve the growing Irish immigrant population, which generally did not live in the district but near it, close to their jobs along the riverfront. It was designed by Brooklyn architect Patrick Keely, himself an Irish immigrant, who had previously designed the Cathedral of the Immaculate Conception on Eagle Street downtown.
By 1870, much of the district had been developed. The lavish houses in particular that lined Ten Broeck Street gave it the nickname "Millionaire's Row." Many had been built by lumber merchants and overlooked the Lumber District, the yards down by the canal and river where they did their business. Another church, Sweet Pilgrim Baptist, was constructed in 1876 at the Clinton Avenue intersection, giving the district a distinctive southern gateway. At the north corner, the polygonal home at 105 Ten Broeck featured an iron mansard roof, a hallmark of the contemporary Second Empire style. Some of the existing houses, such as 8 Hall Place, also had mansard roofs added when they were expanded with third stories.
There was enough demand for housing in the Ten Broeck Triangle that a new street was added in the ensuing decade. St. Joseph's Terrace was laid out in 1881 and formally subdivided for building ten years later. The houses built there in the 1890s were similar in form to those that had been built in the previous decades, reflecting the area's continuing status as a desirable neighborhood, despite increasing competition from the newer Washington Park, completed in 1882, and the lack of service from the city's new streetcar network. The neighborhood was home to Michael N. Nolan, an Irish immigrant who served as mayor and later, a member of the U.S. House of Representatives.
Architecturally, the new construction largely reflected contemporary trends. There were still a few late Italianate structures like 96 North Swan Street, built in 1885. But most new housing followed the Romanesque Revival of the late 19th century. The brick rectory with stone trim built by S
Arbor Hill Historic District–Ten Broeck Triangle