A symbol of the days when bankers thought of themselves as Medicean princes, this handsome marble Renaissance palazzo bows proudly to fill the curve of Franklin Street. Established in 1875, the Boston Safe Deposit and Trust Company sought a building that would portray the dignity and security of the banking profession. The famed builder Norcross Brothers used Plateau white marble from their quarries in Dorset, Vermont, for the structure. U-shaped in plan, with the light court above the third level facing Arch Street, the main facade contains three double-height arches flanked by iron torchbearers. Now home to the Boston Stock Exchange, the main entrance is blocked by video displays with stock reports; the trading floor, since 9/11, cannot be visited.