619 – 612 Mulberry St., Frank E. Carpenter, architect. Source: June 18, 1916 p 21
Security Building Co. contractors; W. C. Schoonover, Sanitary Plumbing; Rockford Gas Light $ Coke Co water heaters; J. Holmquist & Son lumber yards; A. W. Wheelock, lighting fixtures; Milburn Bros. General Cement Contractors; Kerner Incinerator Co. Kerner ‘Built-in-the-Chimney’ Garbage and Refuse Incinerator; Harmon & Nicholas Heating Contractors and Engineers.
Source: Rockford Morning Star June 18, 1916 p 21
Sovereign Apartments, 612 Mulberry. 1917 McCoy’s Rockford City Directory