|Location||121 W. Main St., Rockville, Connecticut|
|Area||6.4 acres (2.6 ha)|
|Architectural style||Second Empire, Italianate, Queen Anne|
|NRHP reference #||78002858|
|Added to NRHP||July 18, 1978|
The Florence Mill, known later as the U. S. Envelope Building after being absorbed by the U. S. Envelope Company, is a former industrial facility located at 121 West Main Street in the Rockville section of Vernon, Connecticut. It is a four story brick structure, more than 200 feet (61 m) in length, with a Second Empire-style mansard roof and an Italianate tower. It was built in 1864 to replace an earlier textile mill which was destroyed by fire. In 1881, it was described as the largest brick building in Rockville. After purchase by White & Corbin, the building was expanded and became the largest manufacturing plant of its kind in the United States. The building was used for the manufacture of envelopes until 1975. Currently, the building is used as an independent living retirement home and has 113 apartments.
- Lewis Angel Corbin Biography, as recorded in: Commemorative Biographical Record of Tolland and Winham Counties Connecticut, Biographical Sketches of Prominent and Representative Citizens and of many of the early settled families, Publisher: J.H.Beers & Co., CHICAGO; 1903 P. 212