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Jeweler’s Row (Carstairs Row) was designed by builder and architect Thomas Carstairs circa 1799 through 1820, for developer William Sansom, as part of the first speculative housing developments in the United States, and introduction of the Row house in the United States. Carstairs Row was built on the southern part of the site occupied by "Morris’ Folly" – Robert Morris’ unfinished mansion designed by L'Enfant.

Sansom bought (at sheriff's sale) the property and unfinished house of Robert Morris, on Walnut St. between 7^th and 8^th Sts. Sansom bisected the land with a new east-west eponymous street. Carstairs purchased the south side of Sansom Street and erected 22 look-alike dwellings. Prior to this time houses had been built in rows, but individually. It can be contrasted with Elfreth's Alley where all the house are of varying heights and widths, with different street lines, doorways and brickwork.

The grid pattern laid down by William Penn, and continued by subsequent planners and surveyors heavily influenced the row house form of architecture. The block-long row house is an important example of Philadelphia’s architectural and developmental history.

Sansom erected the buildings on what was then the outskirts of Philadelphia. To attract tenants he paved Sansom Street at his own expense. A prominent feature of the street is the repetitive flat expanse of the buildings, which made it ideal for commercial conversion.

To find this cache, plant yourself firmly in the history of the street, you won't have to dig to far to find the cache.