Construction:

Architect:

Owners:

Mrs. Grace Millard Knox, widow of Seymour H. Knox (1861-1915)

Mrs. Knox, the former Grace Millard of Detroit, met her husband when he came to Buffalo on a vacation trip with a party of girls. They married in 1890.

Knox and his wife had been living at 1035 Delaware when Knox died in 1915..Mrs. Knox was about 54.

According to Architectural Historian Francis R. Kowsky,

In 1915, the widow of Seymour H. Knox announced that she would build a residence costing one million dollars on property she had purchased on Delaware Avenue north of Summer Street. The new house in the French Baroque style was designed by New York City architect Charles Pierrepont H. Gilbert and replaced an older Italianate house that stood on the property.

Mrs. Knox had decided to build her home next to the rambling stone mansion at 786 Delaware that Edward B. Green had designed in 1913 for Stephen M. Clement, the president of the Marine National Bank. -- Francis R. Kowsky, "Delaware Avenue," in The Grand American Avenue 1850-1920. San Francisco: Pomegranate Artbooks, 1994

Mrs. Knox, her son Seymour H., Jr., and daughters Marjorie and Dorothy lived in the mansion after Mr. Knox's death.

( 57 Oakland which is directly behind this house: Construction began on the Georgian Revival mansion in 1924, the year after Seymour Jr. had married Helen Northrup. Construction was completed the following year and Seymour and Helen moved into their new home, which was a gift from Seymour's mother [Grace Millard Knox]. The architect was C. P. H. Gilbert of New York City, who had designed the Knox mansion at 800 Delaware Avenue a few years earlier.) 

(Seymour H Knox, Jr.'s, sons, Northrup and Seymour H. III [d. 1996], co-owned the Buffalo Sabres) The last Knoxes to occupy the home were Marjorie Knox Klopp, her husband, and two children

In 1969, The Montefiore Club, a private men's association, purchased the residence to use as its headquarters They hired the architectural firm of Milstein, Whick, Davis and Hamilton to remodel the house into a private club.

The club added athletic facilities to the rear of the building, including a gymnasium, squash courts, and locker room with shower facilities.

By 1978, the club was unable to keep up the expenses needed to maintain the mansion, and the bank foreclosed the mortgage

In 1978 Computer Task Group purchased the Knox mansion from the Montefiore Club for $1.3 million to serve as its new headquarters. CTG petitioned the City to change the number from 806 to 800 Delaware Avenue.