The remainder came from a section known as Mary J. Piatt's South Addition, which adjoined the southern Out Lot and was platted in 1858. By 1875, the Out Lots section of South Charter Street had been developed, but the section in the addition was still largely empty.
The remaining land originated from a subdivision named Mary J. Piatt's South Addition, bordering the southern Out Lot and mapped in 1858. Within a decade, the Out Lots segment of South Charter Street was built up, yet the addition area remained largely undeveloped.