The new version reduces the building's height but expands the project's footprint to encompass an adjacent property that it now has under contract to buy, Von Spreckelsen, the New York-based president of Toll's urban-focused City Living division, said in an interview earlier Tuesday. While plans call for the building on that property, the home of the Sidney Rosen Co. jewelry shop at 712-714 Sansom St., to remain unaltered, its addition to the project site gives the developer more "floor area" to add to the tower under the city's zoning rules.