The Carlson Courier Silk Mill was built in Petaluma in 1892. The style of architecture is Georgian Colonial Revival. This mill made silk thread. Back then its proximity to the Petaluma river was an asset for shipping.
Manufacturing in the building halted in 2006.
This is a photo from Wikimedia, attributed to ‘Sanfranman 59’. Since its closing, plans have been made to convert it to condos, then a hotel, but none of the plans came to fruition. It is currently for sale. I hope the fact that this building is in the National Register of Historic Places means that it won’t be torn down.