Just outside the western border of Pawtucket, in Mineral Springs, Darling established a slaughterhouse which utilized every part of the animal for meat, oil, tallow, and fertilizer.
In 1881, he established a branch office in Chicago, which acquired cattle for his Rhode Island slaughterhouse.
By 1884, fertilizer was his main business, under the name of the Darling Fertilizer Company.

He also served as director or president of several companies including the Pacific National Bank of Pawtucket, the Pawtucket Gas Company, and the Swan Point Cemetery Company.

Darling commissioned and was the sole owner of the Music Hall Building on Pawtucket's Main Street.
The Music Hall building had a 1700-seat theater on the second floor, with three seating sections: an orchestra, balcony, and second balcony.
It was considered one of the most beautiful buildings in Pawtucket.
The building originally hosted opera and vaudeville performances; later it showed motion pictures.
The Music Hall Building was demolished in 1970 as part of a downtown urban renewal project.
Just outside the western border of Pawtucket, in Mineral Springs, Darling established a slaughterhouse which utilized every part of the animal for meat, oil, tallow, and fertilizer. In 1881, he established a branch office in Chicago, which acquired cattle for his Rhode Island slaughterhouse. By 1884, fertilizer was his main business, under the name of the Darling Fertilizer Company.
He also served as director or president of several companies including the Pacific National Bank of Pawtucket, the Pawtucket Gas Company, and the Swan Point Cemetery Company.
Darling commissioned and was the sole owner of the Music Hall Building on Pawtucket's Main Street. The Music Hall building had a 1700-seat theater on the second floor, with three seating sections: an orchestra, balcony, and second balcony. It was considered one of the most beautiful buildings in Pawtucket. The building originally hosted opera and vaudeville performances; later it showed motion pictures. The Music Hall Building was demolished in 1970 as part of a downtown urban renewal project.
Lucius B. Darling