That same year, at age 27, he won the design competition for the Philadelphia Masonic Temple, the building for which he is best remembered.

In 1871, he was named architect for the Stephen Girard Estate, designing several buildings at Girard College and a complex of stores on Market Street that became Snellenburg's Department Store.

As supervising architect for the U.S. Treasury Department in Washington, D.C. from 1889 toi 1891, he was responsible for all U.S. federal government construction.

He served as president of the Philadelphia Chapter of the American Institute of Architects from 1879 to 1886.

The arch features a bronze bust of him developed by sculptor Samuel Murray.