The grid pattern laid down by William Penn and continued by subsequent planners and surveyors heavily influenced the row house form of architecture.A prominent feature of the street is the repetitive flat expanse of the buildings, which made it ideal for commercial conversion.In 2016, real estate company Toll Brothers obtained a zoning and demolition permit to construct a twenty-nine story tower of condominiums on the 700 block of Sansom Street.[7][8] This decision has been met with fierce local opposition, with signs denouncing the project appearing in the windows of several buildings on Sansom Street,[9] as well as criticism from Philadelphia Inquirer architecture columnist Inga Saffron.Its Victorian style is typical of the buildings that became the center for jewelry and diamond merchants who developed Jewelers’ Row in the mid-19th century (1860–1879).