additional lots the same week, and by 1832, at least 24 lots had been sold to African Americans. Additional nearby development was centered around "York Hill", a plot bounded by where Sixth and Seventh Avenues would have been built, between 79th and 86th Streets. York Hill was mostly owned by the city, but were purchased by William Matthews, a young African American, in the late 1830s. Matthews's African Union Church also bought land in Seneca Village around that time. More African Americans began moving to Seneca Village after slavery in New York state was outlawed in 1827. In the 1830s, people from York Hill were forced to move so that a basin for the Croton Distributing Reservoir could be built, so many of York Hill's residents migrated to Seneca Village. The reservoir's massive granite walls formed a prominent landmark, bordering Seneca Village on the east. Seneca Village provided a safe haven during the anti-abolitionist riot of 1834. Later, during the Great Famine of Ireland, many Irish immigrants came to live in Seneca Village, swelling the village's population by 30 percent during this time. Both African Americans and Irish immigrants were marginalized and faced discrimination throughout the city. Despite their social and racial conflicts elsewhere, the African Americans and Irish in Seneca Village lived close to each other. By 1855, one-third of the village's population was Irish. George Washington Plunkitt, who later became a Tammany Hall politician, was born in 1842 to Pat and Sara Plunkitt, two of the first Irish settlers at the western edge of the village on Nanny Goat Hill. This location was in the vicinity of a cluster of Irish-American households led by John Gallagher. Richard Croker, who later became the leader of Tammany, was born in Ireland, but he came with his family to Seneca Village in 1846, and lived there until his father received a job that enabled them to move. By 1855, there were 52 houses in Seneca Village. On maps of the area, most of the houses were identified as one-, two-, or three-story houses made out of wood. Archeological excavations uncovered stone foundations and roofing materials, indicating that they were well-built. Some of the houses were identified as shanties, meaning that they were less well-constructed. Land ownership among Black residents was much higher than that in the city as a whole: more than half owned property in 1850, five times the property