This growth would continue due to transportation improvements in the 1820s. Troy's businessmen had already built a turnpike to Schenectady, the path followed today by Route 2 from Troy to Colonie. These trade routes were enhanced by the Erie and Champlain canals, which opened new markets to the north and west, while the Troy Steamboat Company's debut did likewise for the south. The access to iron ore mines in the Adirondack Mountains also got some local businessmen into iron refining. In 1835 the Rensselaer and Saratoga Railroad brought that technology to the city, and in 1842 the completion of the Schenectady and Troy Railroad linked Troy to the vast network that reached as far west as Buffalo. The stage was set for Troy's industrialization. The development of the detachable collar by Hannah Lord Montague in 1827 had given the city the product that still lends it its "Collar City" nickname. Plants were built to manufacture them commercially, as well as cuffs and other textile products. Most of these were located to the north of the downtown area, as it was continuing to grow as the city's commercial district and residential area for the well-to-do of the time along Second Street. With the newer money and newer neighborhoods came newer architectural trends. St. Paul's Episcopal Church, built in 1827, is an early Gothic Revival church, based on Ithiel Town's Trinity Church in New Haven, Connecticut. Eight years later, Town himself would design the Cannon Building in collaboration with Alexander Jackson Davis. Greek Revival residences were first built in Troy along Second Street in the late 1820s. In 1839, six local businessmen bought a parcel of land between Second and Third at the south end of what was then the developed area of the city and created Washington Park. Modeled on contemporary British residential squares such as those found in London's Bloomsbury neighborhoods, its first phase, on Washington Place, featured rows of townhouses with a unified facade fronting on a park reserved exclusively for residents, whose deeds require a monthly maintenance fee. It retains its integrity despite some later alterations and damage, and is one of only two privately owned urban parks in New York. In 1843, another group of planned Greek Revival townhouses was built at 160-168 Second Street. Unusual for urban houses, they featured one-and-a-half-story porticos on their front facades, with Ionic columns, and (originally) side yards. Another house was