Second Leiter Building [SEP] architect
the earliest commercial buildings constructed with a metal skeleton frame remaining in the United States.
Built in 1891 by Levi Z. Leiter, (1834-1904), the Second Leiter Building was designed by architect William Le Baron Jenney, who implemented the skeletal frame made of steel to make the design fireproof. The building was leased by Levi Leiter to the department store of Siegel, Cooper and Company who occupied it for approximately seven years. After Siegel Cooper closed, the building hosted various tenants until it became the downtown flagship store
First Leiter Building
The First Leiter building (or Leiter I) was a Chicago commercial structure built in 1879 by Le Baron Jenney and demolished in 1972. Leiter Building was renovated in 1888. About used a new style of glass windows in this buildings which was followed by others throughout 20th century. 
See also.
- Chicago architecture
- Second Leiter Building