matching set of original ornamental cast iron doorknob backplates salvaged from the union trust building designed and built by louis sullivan and dankmar adler. the union trust building was constructed in 1892-3. this structure, built in a "u" shaped plan with two wings surrounding a central light court, was designed by louis sullivan's firm immediately after their famous wainwright building. structurally, it is considered to be more pure than its better known contemporary. modifications of the first two floors in 1924 eliminated some of the buildings important architectural elements such as its arched entryways and circular windows. above that level, the building returns to its original characteristics, with uninterrupted brick shafts from the third to the twelfth floors. above the rounded arch windows of the twelfth floor, a two story cap has terra cotta lion heads projecting from its spandrels. rich sullivanesque ornamentation adorn the cornice. the interior office door backplates were manufactured by the yale & towne hardware co. the design or pattern is known as "senlis" under the y & t hardware catalog modern renaissance school classification. the senlis pattern and another known as the "parma" design were created or drawn by the hand of louis h. sullivan for the c. 1893 union trust building in st. louis and the c. 1898 bayard building (located in new york city) respectively. although yale and towne executed other sullivan-designed hardware for various building commissions, these two patterns went on to become a "common stock" design offered to the public in yale & towne catalogs (i.e., page 714 & 715 of the 1910 hardware catalog). the office door escutcheons retain the original bower-barff "rustproof" baked black enameled finish. priced for the pair.