Here's one wacky building example I particularly like: canneries devouring houses. This first photo is from the Salsina cannery at Lincoln Ave and Auzerais in San Jose. The original building was built in 1917 or so for a new tomato paste producer, with thick concrete walls and a sawtoothed roof for better interior lighting. That cannery must have been hungry, for a later addition swallowed up a small two story house that had been on the property.
I went inside the cannery a couple years ago when it was still occupied by a discount furniture outlet. The main factory floor was packed with dinettes, end tables, and bar stools. Behind the furniture on the back wall, I could see the outline of a cute two story house peeking into the building. They'd repurposed it as the business's office, so it still looked like a separate building, swallowed up by its neighbor.
Now, canneries swallowing up houses probably isn't that common, but these photos hint that canneries, with enough growth in volume and too little land for expansion, are likely to use every bit of land they can. If an accessory building happens to get in the way, it's not going to be free-standing for long.
Photos of Salsina Canning taken by me earlier this year. Photo of Plant #3 from a John C. Gordon panoramic photo of the San Carlos St. bridge add Del Monte plant, taken around 1932. Original photo in the San Jose State University Special Collections.