Between 1900 and 1906 the Beezer twins, Michael and Louis, designed five brick commercial buildings in western Pennsylvania, four of them with a stone first story and all crowned with elaborate terra-cotta ornament on the top story and cornice. The first story of their first Beaux-Arts-inspired building, the Pennsylvania National Bank (c. 1900) at 3400 Butler Street in Pittsburgh, is repeated here with the same rusticated limestone and round-arched windows. This building has three-sided bay windows to enliven the building's red brick midsection, as did the First National Bank of Tyrone (demolished). The finest of Beezer Brothers' commercial buildings, this bank is one of the few buildings they signed with a plaque. Beezer Brothers employed their patented fireproof flooring system, using hollow clay tiles tied to the masonry walls rather than steel supports that twist when exposed to intense heat. The Beezers never used stock designs and prided themselves on discarding their previous drawings. So while there is some similarity among their commercial buildings, each is different.